Coaxial Motor Steering Device for Tiltable Cabins
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Solution Overview
Problem
The layout problem arises when an electric motor is disposed in a vehicle cabin, particularly in vehicles with tiltable cabins, as it requires a different configuration to accommodate the motor while ensuring sufficient storage space and allowing for cab tilting without compromising the telescopic range of the steering shaft.
Innovation Solution
A steering device with a coaxial motor integrated into the vehicle cabin, where the motor surrounds the steering shaft and is supported by a bracket extending along the axial direction, allowing for adjustable positioning and preventing compression of leg space, while ensuring the telescopic range necessary for cab tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the electric motor is disposed in the vehicle cabin, then the steering force can be applied to the power steering unit for automatic steering operations, but the storage space in the vehicle cabin is reduced and the layout becomes problematic
Solution Approach 1:
The electric motor is disposed inside the steering shaft, utilizing the hollow space within the steering shaft structure. This nesting approach allows the motor to be integrated into the existing steering system without occupying additional cabin space, thereby enabling automatic steering operations while preserving storage space in the vehicle cabin.
2Power
If the electric motor is disposed in the vehicle cabin, then the steering assistance can be provided, but the leg space of the driver is compressed
Solution Approach 1:
The electric motor is nested within the steering shaft, which positions the motor in a space that does not encroach on the driver's leg space. This integration allows the motor to provide steering assistance power while maintaining adequate leg space for the driver, avoiding the compression issue that would arise from placing the motor in the cabin.
3Adaptability or versatility
If the steering shaft is made telescopic to accommodate cab tilting, then the cab tilting is enabled, but the space for the electric motor is reduced
Solution Approach 1:
The electric motor is disposed inside the telescopic steering shaft, utilizing the internal space of the shaft. This nested configuration allows the steering shaft to telescope for cab tilting while the motor remains accommodated within the shaft structure, avoiding the need for additional space that would conflict with the telescopic motion.
Solution Approach 2:
The steering shaft is designed to be telescopic, allowing it to dynamically adjust its length to accommodate cab tilting. The electric motor is positioned within this dynamic structure, and the motor's placement is designed to accommodate the telescopic motion, enabling both cab tilting adaptability and motor integration.
4Power
If the electric motor is disposed outside the steering shaft, then the motor can be supported by a bracket, but the layout problem persists and the steering shaft telescopic range is compromised
Solution Approach 1:
The electric motor is nested within the steering shaft rather than being disposed outside. This eliminates the need for external brackets that would interfere with the telescopic range, as the motor is contained within the shaft's internal space, allowing the shaft to telescope freely without external constraints.
Data Source
AI summary
A steering device (1) installed in a vehicle is equipped with: a steering wheel (10); a steering shaft (20) having a first shaft part (21), one end of which is directly connected to the steering wheel (10), and a second shaft part (22) connected to the first shaft part (21) on the other end side thereof; a coaxial motor (50) which applies a rotational force to the first shaft part (21), and has a motor housing (51) which supports the steering shaft (20) and surrounds the periphery of the first shaft part (21); and a support bracket (60) which extends in the axial direction of the steering shaft (20) in a front region inside the vehicle compartment, is secured to the vehicle compartment on the bottom end side and top end side thereof, and at the top end side thereof, sandwiches the motor housing (51) from both the left and right sides in the vehicle widthwise direction.