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bottom bracket unit for bicycles

A shaft and bearing technology that is applied to devices using optical methods, vehicle components, and treatment movements, and can solve problems such as undetectable rotation directions

Active Publication Date: 2016-08-31
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The downside here is that while the rotational speed of the center shaft can be detected, the direction of rotation is not

Method used

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  • bottom bracket unit for bicycles
  • bottom bracket unit for bicycles
  • bottom bracket unit for bicycles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] figure 1 Shown is a central axis unit comprising a central axis 1 , which is mounted rotatably about an axis of rotation 4 relative to a housing 5 by means of two bearings 2 , 3 .

[0029] The first permanent magnetic field is embedded in the region of the first magnetic field section 7 and the second permanent magnetic field is embedded in the metal shaft body of the central axis 1 in the region of the second magnetic field section 8 . If there is no torque within the center shaft 1 , the two permanent magnetic fields surround the axis of rotation 4 concentrically but in opposite directions, so that only stray magnetic fields can be detected outside the center shaft 1 . If, for example, a torque is introduced into the bottom bracket 1 by an operator who introduces a force into the bottom bracket 1 by means of a pedal crank, an external magnetic field is generated due to the magnetostrictive effect in the two magnetic field sections 7, 8, whose magnitude and directions...

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PUM

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Abstract

The invention relates to a center shaft unit comprising a center shaft (1), at least one bearing (2, 3) capable of rotatably accommodating the center shaft (1), and an optical detection unit capable of detecting the rotational speed of the center shaft (1) ( 11), wherein the optical detection unit (11) measures at least one signal generator (12) that resists relative rotation with the central shaft (1). The task of specifying a central axis unit which, in addition to the rotational speed, can also detect the direction of rotation of the central axis is solved according to the invention in that the optical detection unit (11) comprises two optical sensors ( 17 ), wherein one of the two sensors ( 17 ) supplies a signal that is phase-shifted relative to the other sensor ( 24 ) and has a fixed phase difference, in particular a phase difference of 90°.

Description

technical field [0001] The invention relates to a central axle unit and to a bicycle with such a central axle unit, in particular an electric bicycle (E-bike), an electric bicycle (Pedelec) or an ergometer (Ergometer). Background technique [0002] Various bicycles are known from the prior art, in particular electric bicycles, pedelecs or ergometers, which allow the detection of the torque introduced by the operator via the crank into the bottom bracket. In order to determine the power of the operator, for example also to be able to actuate an electric auxiliary drive for a bicycle, the detection of the rotational speed of the center axle is also necessary in addition to the detection of the torque. [0003] DE 10 2009 021 541 A1 describes a center shaft unit with a center shaft, which is rotatably supported by means of two bearings, wherein the bearing cage is fastened to the shaft of the center shaft in a rotationally fixed manner (drehfest) on the surface of the body, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M3/00B62M6/50B62M1/36
CPCB62M3/003Y10S482/901B62M6/50B62J45/421B62J45/412G01P3/36
Inventor 马库斯·诺伊鲍尔斯特凡·格吕克弗兰克·本克特
Owner SCHAEFFLER TECH AG & CO KG