Omnidirectional Drive Unit With Rotary Joint for Stable Complex Motion
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Solution Overview
Problem
Current autonomous omnidirectional drive units lack the ability to perform complex movements that combine simultaneous translational and rotational movements, leading to slow maneuverability and inefficiency in logistics and industrial settings.
Innovation Solution
The proposed autonomous omnidirectional drive unit features a drive chassis with two independent parallel drive wheels, a transport chassis connected through a rotary joint, and a rotary motor that allows for coordinated actuation of the drive and rotary motors, enabling omnidirectional movement. This setup includes a control device for adjusting the motors to achieve complex movements without transferring rotations to the transport chassis, and incorporates shock-absorbing elements and obstacle detection sensors for improved stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the drive unit uses a simple chassis with drive wheels and caster wheels, then the structure is simple and easy to manufacture, but the drive unit cannot perform complicated translational movements or complex movements
Solution Approach 1:
The drive unit is divided into two independent chassis: a drive chassis with drive wheels for propulsion and a transport chassis with caster wheels for support. This segmentation allows each chassis to perform its specialized function while enabling complex combined movements that neither chassis could achieve alone.
Solution Approach 2:
The rotary joint connecting the drive chassis and transport chassis provides dynamic, adjustable angular positioning. This allows the relative orientation between chassis to change continuously during operation, enabling the transport chassis to rotate independently while being propelled by the drive chassis, achieving complex translational and rotational movements simultaneously.
2Adaptability or versatility
If the drive unit uses a rotary joint with locking elements to enable rotation, then the movement possibilities are improved, but the simultaneous and independent rotation of both chassis is limited, reducing maneuverability
Solution Approach 1:
The rotary joint is designed without locking elements, providing continuous, smooth rotational adjustment between the drive chassis and transport chassis. This dynamic configuration allows both chassis to rotate simultaneously and independently during movement, greatly enhancing maneuverability and enabling complex motion patterns that locked joints cannot achieve.
3Adaptability or versatility
If the transport platform is rotated independently with a powerful motor, then the rotational capability is improved, but the motor and gearbox become heavy and large, reducing productivity
Solution Approach 1:
The rotational function is separated from the transport platform and assigned to the drive chassis through the rotary joint. The drive chassis, equipped with drive wheels and motors, provides the rotational capability without requiring a separate powerful motor on the transport platform, avoiding the weight and size penalties of aggressive reduction gearboxes.
Solution Approach 2:
The drive chassis serves multiple functions: it provides forward/backward propulsion through drive wheels and simultaneously provides rotational capability through the rotary joint. This multi-functionality eliminates the need for separate heavy rotational mechanisms on the transport platform, maintaining productivity while achieving rotational capability.
4Strength
If the weight on the transport platform is transmitted to the drive chassis, then the drive chassis must be heavy and powerful, but this reduces the duration of battery operation
Solution Approach 1:
The weight support function is segmented from the drive chassis and assigned to the caster wheels supporting the transport chassis. This allows the drive chassis to be lightweight and energy-efficient while the caster wheels bear the load, as casters are designed for rolling support rather than powered propulsion.
5Adaptability or versatility
If the drive unit performs slow rotational movement with reduction gear box, then the rotational capability is achieved, but the productivity is reduced
Solution Approach 1:
The rotary joint provides dynamic, continuous rotation without aggressive reduction gearboxes. The rotational speed can be adjusted in real-time to match operational requirements, enabling faster rotational movements compared to fixed-ratio reduction gear systems, thereby maintaining high productivity while achieving rotational capability.
Data Source
AI summary
An autonomous omnidirectional drive unit including a drive chassis supported on two independent, parallel, and coaxial drive wheels, actuated by two drive motors; a transport chassis the central area of which is superimposed on and connected to the drive chassis through a rotary joint, the transport chassis being supported on multiple omnidirectional wheels. The drive unit further includes a rotating device, actuated by a rotary motor, integrated in the rotary joint between the transport chassis and the drive chassis, which determines the angular position of the drive chassis with respect to the transport chassis, and a control device configured for adjusting at least the two drive motors and the rotary motor in a coordinated manner to obtain omnidirectional movement of the transport chassis.