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Transmission systems for vehicles

A transmission system and drive shaft technology, applied in the field of transmission systems for vehicles, can solve the problems of complex disassembly and reassembly of the transmission system, exceeding the user's repair or maintenance personnel, and unsatisfactory problems

Active Publication Date: 2020-07-17
FREEFLOW TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, currently known methods are unsatisfactory because harmonic drives are difficult to fit within the frame of a bicycle in that they tend to distort the Q-factor (i.e. the pedal at the pedal hole The distance between the outside of the crank) increases beyond the point at which the rider feels comfortable or stable
[0009] In addition, such drive systems may be difficult to service or repair, as disassembly and reassembly of such drive systems may be complicated and may be beyond the capabilities of the user's local repair or service personnel

Method used

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  • Transmission systems for vehicles
  • Transmission systems for vehicles
  • Transmission systems for vehicles

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no. 2 approach

[0150] The second embodiment transmission 2100 likewise includes a main crank drive shaft 202 powered by cranks 203, 204 and a harmonic drive unit comprising a flex spline 217 defining a field 217a.

[0151] The bracket or secondary shaft 2101 is located substantially within the flexspline 217 location 217a.

[0152] The flexspline coupling 217b is rotationally coupled to the flexspline 217 . The first one-way clutch 223 is rotationally coupled to the flexspline coupling 217b and thus to the carrier or secondary shaft 2101 by being mounted around a cylindrical seat 2101a defined by the outer surface of the carrier 2101 .

[0153] A single internal one way sprag clutch 228 is disposed within and rotationally coupled to cylindrical housing 2101b, which is defined within carrier 2101, wherein internal one way sprag clutch 228 is rotationally coupled to the main crankshaft 202 .

[0154] The bracket 2101 includes at approximately its midpoint a flange 2101c which caps the housi...

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Abstract

The present disclosure relates to transmission systems for vehicles and especially those for use in electric bicycles, where human power is augmented with electric motor derived power. The present disclosure includes various embodiments, where the electric motor is of the harmonic drive type and wherein there is provided a secondary axle or bracket which provides the output of the systems, drivenby both the manual input and the motor input, and wherein these two inputs are insulated from one another by placement of one-way clutches, between the flex-spline and the secondary axle or bracket and between the bracket and the primary drive axle. A modular assembly for such transmission systems and a method of assembly and disassembly are also disclosed.

Description

[0001] field of invention [0002] The present disclosure relates to vehicles (particularly electrically assisted or electrically driven bicycles), drivetrains usable with vehicles but also suitable for other applications, control systems for said vehicles, and frame constructions for bicycles method. [0003] Background of the invention [0004] Electric bicycles are a form of dual-powered transportation, ie, electric bicycles use both manual pedal and crank drives and electric motors. These two drive means can operate independently of each other, or can operate together to augment each other's motive force. The user may choose to selectively engage the electric drive, or the electric drive may be activated automatically based on conditions such as measured pedal speed, bicycle speed, and the like. [0005] The electric drive can be placed in several different positions; the electric drive can drive the hub of the rear wheel and be housed within that hub; the electric drive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H49/00B62M6/55
CPCF16H49/001F16H2200/2069B62M6/55B62M9/122B62M9/124F16H2200/2084
Inventor 尼尔·爱德华尼尔·麦克马丁
Owner FREEFLOW TECH LTD