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Worm gear for an electromechanical power steering system

A technology of power steering and worm gear, which is applied in the direction of mechanical equipment, components with teeth, belts/chains/gears, etc. It can solve the problems of high tolerance requirements, service life, etc., and achieve the effect of good strength characteristics

Active Publication Date: 2017-08-01
THYSSENKRUPP PRESTA AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these solutions is the high technical difficulty in complying with the high tolerance requirements and solving the problem of sufficiently high uniformity of the plastic injection molding so that the components have a long service life

Method used

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  • Worm gear for an electromechanical power steering system
  • Worm gear for an electromechanical power steering system
  • Worm gear for an electromechanical power steering system

Examples

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Embodiment Construction

[0064] Next, preferred embodiments will be described with reference to the drawings. Identical, similar and identically acting elements are marked with the same reference signs. In order to avoid redundant information, repeated descriptions of these elements are partially omitted in the ensuing description.

[0065] figure 1 An overview of a steering system 100 of a motor vehicle is shown, in which the driver can apply a corresponding torque to the steering shaft 1 as a rotation command via a steering wheel 102 . The torque is then transmitted via the steering shaft 1 to the steering pinion 104 , which meshes with the toothed rack 106 , which then transmits the aforementioned steering angle on its side via the corresponding tie rod 108 to the steerable wheels 110 of the vehicle.

[0066] An electric and / or hydraulic booster strut can be provided in the form of booster strut 112 coupled to steering shaft 1 , booster strut 114 coupled to steering pinion 104 and / or booster stru...

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Abstract

The invention relates to a worm gear (4) for an electromechanical power steering system for arranging on a steering shaft (1), comprising an insert (40) which is encapsulated with a plastic in order to form a toothed rim (48), wherein the toothed rim (48) comprises at least one injection section (45) in which at least one injection point (44) is arranged and which has a first material thickness (measured in the direction of the worm gear axis (400)), and the toothed rim (48) comprises at least one retardation section (43) which has a reduced material thickness relative to the injection section (measured in the direction of the worm gear axis (400)), wherein the retardation section (43) of reduced material thickness is arranged between an injection point (44) and the outer surface of the circumferential toothing system (49), wherein the retardation section (43) of reduced material thickness is formed by at least one retardation element (42, 56) for backing up the plastic during the injection moulding encapsulation.

Description

technical field [0001] The invention relates to a worm gear of an electromechanical power steering arranged on a steering shaft, wherein the worm gear contains an insert encapsulated in plastic injection molding for forming chain teeth. Background technique [0002] The use of electromechanical power steering requires a further drive, which transmits the power assist torque from the electric motor to the steering shaft. Generally, an electric motor drives a worm, which meshes with a worm gear mounted in a rotationally fixed manner on the steering shaft. Worm gears usually consist of at least two structural parts, namely an insert which is placed in a rotationally fixed manner on the shaft to be supported and a plastic sprocket which is sprayed on the insert. Plastic sprockets allow for low gear running noise and low flank wear throughout the life of the gear. Where the insert and sprocket are made of the same plastic or different plastics. In order to obtain as uniform a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/14F16H55/06F16H55/22F16H55/24
CPCF16H55/06B29C45/0025B29C45/0046B29C45/14549B29C2045/0049F16H55/22F16H55/24F16H2055/065
Inventor 艾夫斯·施内尔曼
Owner THYSSENKRUPP PRESTA AG
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