US 2020/0063796 A1Published application

Steering System

AssigneeRobert Bosch GmbH

InventorsJens-Uwe Hafermalz, Dennis Fuechsel

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Abstract

A steering system for a motor vehicle includes a steering gear and a steering motor. The steering gear includes a housing, gear, screw pinion shaft, fixed bearing, and floating bearing. The fixed bearing has a rotational bearing received in a sleeve, and a pivot ring with inner and outer rings pivotably connected by at least one torsion web. The shaft has a screw pinion meshed with the gear and a portion to one side of the pinion mounted in the rotational bearing. The inner pivot ring is integrated into or connected to the sleeve, and the outer ring is fixed to the housing. The floating bearing is positioned on the other side of the screw pinion, has a further rotational bearing rotatably received in a bushing mounted in the housing, and mounts the other side portion of the shaft. The motor is drivingly connected to the shaft via a coupling element. At least one of (i) one or more of the outer ring and the bushing is fixed to the housing solely via a vibration-damping decoupling element, and (ii) one or more of the pivot ring, the bushing, the pinion, the gear and the coupling element are at least partially made from a vibration-damping material. A vibration excitation, and thus a sound emission of the housing due to vibrations produced from rotation of the shaft and the gear, is kept as low as possible, thereby having a positive effect on the noise behavior of the steering system during operation.

Claims3

Dependent claims

A steering system for a motor vehicle, comprising:

a steering gear, including:
a housing;
a toothed wheel;
a fixed bearing, having:
a bearing sleeve
a rotary bearing received in the bearing sleeve;
and
a pivot ring that includes:
one or more torsion webs;
an outer ring fixed in the housing;
and
an inner ring connected to or integrated into the bearing sleeve, the inner ring and the outer ring pivotably connected to each other via the one or more torsion webs
a floating bearing, having:
a bearing bushing mounted in the housing;
and
a rotary bearing received in the bearing bushing so as to be radially mobile within the housing, and
a helical pinion shaft, having:
a first portion received in the rotary bearing so as to be mounted in the fixed bearing;
a second portion received in the rotary bearing of the floating bearing so as to be mounted in the floating bearing;
and
a helical pinion that meshes with the toothed wheel, and that is located between the first portion and the second portion;
a clutch element;
and
a steering motor connected, exclusively via the clutch element, with rotational driving action, to the helical pinion shaft of the steering gear,
wherein at least one of:
(i) one or more of the outer ring of the pivot ring of the fixed bearing and the bearing bushing of the floating bearing fixed in the housing via interposition of a vibration-damping decoupling element, and
(ii) at least one of the pivot ring of the fixed bearing, the bearing bushing of the floating bearing, the helical pinion, the toothed wheel and the clutch element is formed at least partially from a vibration-damping material.

24 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/462,809Filed 6 Oct 2017
Priority: DE 10 2016 122 378.621 Nov 2016
Published: 27 Feb 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B62D 5/0409
Electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear: electric motor acting on the steering column
F16C 32/0688
For radial load only: with floating bearing elements
B62D 5/0463
Controlling the motor: calculating assisting torque from the motor based on driver input
F16C 27/04
Elastic or yielding bearings or bearing supports, for exclusively rotary movement: ball or roller bearings, e.g. with resilient rolling bodies