Coaxial Motor Steering Device Layout for Tiltable Cab
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Solution Overview
Problem
Conventional steering devices face challenges in layout quality around the steering shaft due to the need to accommodate a motor without interfering with other devices, such as a parking brake and switch panel.
Innovation Solution
A steering device with a tiltable vehicle cabin featuring a coaxial motor with an output shaft arranged coaxially with the first steering shaft, allowing the second steering shaft to be extendible and retractable, thereby improving layout efficiency by positioning the motor without interfering with surrounding devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor is arranged around the steering shaft to apply rotational force, then the steering function is achieved, but the layout quality around the steering shaft deteriorates due to interference with other devices
Solution Approach 1:
The motor is repositioned from a lateral arrangement around the steering shaft to a coaxial arrangement along the axial direction of the steering shaft. This dimensional change allows the motor to be integrated into the existing vertical space without interfering with horizontally disposed devices such as the parking brake and switch panel, thereby improving layout quality while maintaining steering functionality
2Adaptability or versatility
If the second steering shaft is made extendible and retractable to accommodate cab tilting, then the adaptability to vehicle cabin tilting is improved, but the structural complexity increases
Solution Approach 1:
The second steering shaft is designed with extendible and retractable capability, transforming it from a static component to a dynamic one. This allows the steering shaft to adapt its length according to the vehicle cabin's tilting state, ensuring proper geometric relationships and steering performance across different cab positions without requiring a completely separate adjustment mechanism
3Ease of operation
If the motor is positioned coaxially with the first steering shaft, then the layout quality around the steering shaft is improved, but the motor placement constraints increase
Solution Approach 1:
The coaxial motor serves multiple functions: it provides steering assistance torque, maintains proper geometric relationships during cab tilting through its axial positioning, and enables the second steering shaft to function as both a structural support and a movable linkage. This multi-functionality justifies the more constrained placement by eliminating the need for separate components
Data Source
AI summary
A steering device exhibiting improved layout properties around a steering shaft. A steering device installed in a vehicle, the vehicle compartment of which is capable of tilting, has: a first steering shaft, one end of which is connected to a steering wheel; a second steering shaft positioned below the first steering shaft and in a manner such that the one end thereof connected to the other end of the first steering shaft is located above the floor section of the vehicle compartment; and a coaxial motor which applies a rotational force to the first steering shaft and is provided in a manner such that the output shaft thereof is coaxial with the first steering shaft. Furthermore, the second steering shaft is capable of telescoping, because a shaft and a cylindrical member are connected so as to be capable of sliding relative to one another in the axial direction.