Steering Gear Bearing Device for Torque Detection
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Solution Overview
Problem
Existing steer-by-wire steering devices struggle to accurately detect forces and torques acting on the steering rod, which limits the effectiveness of the feedback drive in simulating steering conditions.
Innovation Solution
A steering gear with a bearing device fixedly attached to the steering rod housing, which blocks rotational movement of the steering rod while allowing translational displacement, and incorporates a sensor device to detect forces and torques acting on the steering rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bearing device is introduced to block rotational movement and enable translational displacement of the steering rod, then the steering rod can be precisely constrained in motion, but the device complexity increases
Solution Approach 1:
The bearing device acts as an intermediary element between the steering rod and the steering rod housing. It mediates the motion constraints by providing a controlled interface that blocks rotation while permitting translation, thus resolving the contradiction between motion stability and structural simplicity
Solution Approach 2:
The bearing device is segmented into a bearing outer ring fixed to the housing and a bearing inner ring attached to the steering rod. This segmentation allows independent optimization of each component's function while maintaining overall system simplicity
2Measurement precision
If a sensor device is added to detect forces and torques on the steering rod, then measurement precision improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The sensor device is merged with the bearing device, where the bearing inner ring serves as the mounting structure for the sensors. This combination eliminates the need for separate sensor housings and integration structures, reducing overall complexity while maintaining measurement precision
Solution Approach 2:
The bearing inner ring serves multiple functions: it constrains rotational movement, enables translational displacement, and provides a mounting platform for force and torque sensors. This multi-functionality reduces the number of separate components needed in the system
Data Source
AI summary
The invention relates to a steering gear (1) for a steer-by-wire steering device for a vehicle and with a steering rod (4), wherein the steering rod (4) is connected to an electric drive (2) by means of a transmission device (3). In order to be able to better detect the forces acting on the steering rod (4), the steering gear (1) is characterized in that a bearing device (12) is arranged between the steering rod housing (11) and a steering rod portion (13) of the steering rod (4), wherein the bearing device (12) is fixedly attached or held on the steering rod housing (11), and the steering rod portion (13) and the bearing device (12) engage with one another in such a way that a rotational movement of the steering rod (4) is blocked and a translational displacement of the steering rod (4) in the axial direction of the central longitudinal axis (5) of the steering rod (4) is allowed, wherein a sensor device (29) for determining a torque of the steering rod (4) about the central longitudinal axis (5) of the steering rod (4) is arranged in the region of the bearing device (12).