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Torque sensor unit comprising a magnetic shield

A technology of torque sensor and sensor unit, applied in force/torque/work measuring instruments, instruments, torque measurement and other directions, which can solve problems such as sensor interference

Pending Publication Date: 2021-10-12
THYSSENKRUPP PRESTA AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The earth's magnetic field also interferes with the sensor

Method used

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  • Torque sensor unit comprising a magnetic shield
  • Torque sensor unit comprising a magnetic shield
  • Torque sensor unit comprising a magnetic shield

Examples

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Embodiment Construction

[0031] figure 1 Illustrated is a torque sensor unit 1 that measures the rotation of the upper steering shaft 2 relative to the lower steering shaft, not shown, as a torque applied manually by the driver on or connected to the upper steering shaft 2 . Measurement of the torque on the steering wheel. The upper steering shaft 2 and the lower steering shaft are coupled to each other in a rotationally elastic manner via a not shown torsion bar. The torque sensor unit 1 has a rotational angle sensor, which is also referred to as a torque sensor. Depending on the torque measured by the torque sensor unit 1, the servo unit provides steering assistance to the driver.

[0032] The torque sensor unit 1 has a ring magnet (permanent magnet) 4 which is connected to the upper steering shaft 2 in a rotationally fixed manner and has a plurality of poles. A set of flux conductors 5 fixed to the lower steering shaft is arranged in the magnetic field generated by the multipole magnet 4 . Each...

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PUM

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Abstract

The invention relates to a torque sensor unit (1) comprising: - a ring magnet (4) which can be connected to a first partial shaft (2) for conjoint rotation therewith, and which is arranged concentrically with respect to a longitudinal axis (100); - two first magnetic flux conductors (5) which can be connected to a second partial shaft, which are arranged in a magnetic field originating from the ring magnet (4), and which conduct the magnetic fluxes; - a physically fixed sensor unit (7) having two second magnetic flux conductors (9) and a magnet sensor (11) arranged on a printed circuit board (10), which are accommodated in a sensor housing (8) of the sensor unit (7), wherein the sensor unit (7) is designed to detect a rotational angle change between the partial shafts (2) by measuring the magnetic flux density generated between the two first magnetic flux conductors (5); - and a second housing (12), which surrounds the ring magnet (4), the two first magnetic flux conductors (5) and the sensor unit (7), characterized in that the torque sensor unit comprises a magnetic shield (19), which surrounds the sensor unit (7) at least in part peripherally relative to the longitudinal axis (100) and which, in the direction of the longitudinal axis (100), is arranged between a housing cover (13) which closes the second housing (12) and the second housing (12).

Description

technical field [0001] The invention relates to a torque sensor unit having the features of the preamble of claim 1 and to an electromechanical power steering system for a motor vehicle comprising such a torque sensor unit. Background technique [0002] Torque sensors are used in motor vehicles to measure the torque introduced by the driver into the steering wheel. Currently used torque sensors are magnetic sensors whose measured values ​​can be easily disturbed by external magnetic fields. Motor vehicles in the future will be and to some extent already are fully or partially electrically operated, which may lead to measurements that are influenced by high-intensity external magnetic fields through high-ampacity cables, usually located in the vicinity of the steering system. The Earth's magnetic field can also interfere with the sensor. [0003] The prior art discloses a series of torque transducers with magnetic shields. [0004] Patent US 7,021,161 B2 discloses a steeri...

Claims

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Application Information

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IPC IPC(8): G01L3/10
CPCG01L3/104G01L5/221B62D3/12B62D15/022
Inventor 罗曼·阿耶尔彼得·克诺尔山多尔·科瓦奇彼得·绍博蒂瓦达尔·克里什托夫·托特
Owner THYSSENKRUPP PRESTA AG
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