Rack and Pinion Propulsion for Vertical Rail Robots
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Solution Overview
Problem
Existing autonomous robotic systems for warehouse and logistics automation face challenges in efficiently navigating and securing attachment to vertical and horizontal rails, particularly in terms of friction-dependent propulsion systems that are limited in vertical movement and prone to noise and vibration.
Innovation Solution
A propulsion system utilizing a rack and pinion actuator with metal pinion gears meshing with polyurethane tooth blocks on the rails, combined with locking assemblies and rotating junction rails, allows for secure attachment and efficient movement up and down vertical rails and back and forth on horizontal rails, reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If friction-dependent propulsion systems are used for rail navigation, then the robot can move along rails, but the system is limited in vertical movement capability and prone to noise and vibration
Solution Approach 1:
The patent replaces friction-dependent mechanical propulsion with a rack and pinion gear system. The pinion gears on the robot mesh with tooth blocks on the rails, converting rotational motion into linear motion along the rails. This mechanical substitution eliminates friction-based drive limitations, enabling reliable vertical movement along 90-degree slopes while reducing noise and vibration through positive engagement rather than friction-based traction.
Solution Approach 2:
The patent changes the propulsion mechanism from friction-dependent to gear-engagement-based. By introducing tooth blocks on the rails and pinion gears on the robot, the system transforms the interaction mode from continuous friction contact to discrete gear meshing. This parameter change in the propulsion mechanism enables the robot to climb vertical slopes efficiently while minimizing harmful noise and vibration associated with friction-based propulsion.
2Ease of operation
If friction-dependent propulsion systems are used, then the robot can travel on rails, but lubrication is required which compromises cleanliness
Solution Approach 1:
The patent substitutes friction-based propulsion with a rack and pinion gear system that uses positive mechanical engagement. The pinion gears mesh with tooth blocks on the rails, transmitting force through gear teeth rather than friction. This eliminates the need for lubrication to reduce wear and friction, thereby maintaining warehouse cleanliness while preserving full rail travel capability including vertical movement.
3Adaptability or versatility
If simple wheel assemblies are used for floor propulsion, then the robot can move on the floor, but the system lacks secure attachment capability on rails
Solution Approach 1:
The patent designs the front wheel assemblies to serve multiple functions: floor propulsion, rail engagement, and secure attachment. Each wheel assembly includes both a drive wheel for floor movement and a pinion gear for rail engagement. The locking assembly with cam rollers provides secure attachment when on rails while allowing smooth floor navigation. This multi-functional design enables the robot to reliably operate in both floor and rail modes without requiring separate specialized components.
Solution Approach 2:
The patent implements a dynamic locking mechanism using cam rollers that can engage with or disengage from the rails based on the robot's operational mode. When on rails, the cam rollers lock into the rail structure to provide secure attachment. When on the floor, the locking mechanism disengages to allow smooth movement. This dynamic adjustment of the attachment state enables the same wheel assembly to provide reliable rail attachment and smooth floor navigation as needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances the robotic system's ability to cling to and travel on rails, enabling efficient navigation and increased versatility, including the ability to ascend 90-degree slopes, while minimizing noise and vibration, and maintaining cleanliness by eliminating the need for lubrication.
Implementation Method 1
a rack and pinion actuator is formed by meshing the at least one pinion gear in the front wheel assemblies with tooth blocks on the terminals and rails and activating the electric motor and gear drive assembly to rotate the at least one pinion gear; whereupon the rack and pinion actuator propels the robot up and down the terminals and vertical rails and back and forth on horizontal rails
Implementation Method 2
The three small cam rollers consist of two parallel cam rollers configured to roll in cam paths in the sides of the terminals and rails and a single lateral cam roller configured to roll against a side of the terminal or rail above the cam path. The small cam rollers keep the robot moving straight and prevent the robot from twisting and falling off the terminal or rail.
Implementation Method 3
the drive assembly comprises an electric motor and gear assembly, which are configured to rotate a front drive wheel on an axle parallel to a surface on which the robot is travelling, thereby propelling the robot on a floor of the warehouse to or from a terminal
Data Source
AI summary
Disclosed is a propulsion system for propelling autonomous robots on vertical and horizontal rails that support shelves on which items are stored in a warehouse. The propulsion system changes the principle of travelling on the rails from being dependent on friction between the front wheels and the rail to a system that is dependent on a rack and pinion gear assembly. Also described is a locking assembly that allows the robot to cling to the rails and travel up and along them to reach required destinations on the shelves.