Motorized Roller Torque Transmission via Adhesive Bonding
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Solution Overview
Problem
Conventional roller conveyor motorized rollers experience positional displacement (slip) due to hardening or loosening of elastic components over time, leading to inefficiencies in torque transmission.
Innovation Solution
A power transmission mechanism featuring first and second cylindrical members with a screwing mechanism and a pressure-sensitive adhesive layer, where at least one surface is tapered, ensuring secure adhesion between the members and the roller tube, preventing slip through adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic ring is used to transmit torque from the drive plate to the roller tube, then torque transmission is achieved, but the elastic ring hardens or the tightened disks loosen over time due to aging, causing positional displacement (slip)
Solution Approach 1:
The patent replaces the mechanical elastic ring and tightened disk system with a chemical bonding system using pressure-sensitive adhesive. The adhesive layer is applied to the outer circumferential surface of the drive plate, creating a chemical bond between the drive plate and roller tube that does not degrade over time like mechanical friction-based systems. This substitution eliminates the hardening and loosening problems inherent in mechanical elastic connections.
Solution Approach 2:
The patent changes the bonding mechanism from mechanical (friction-based elastic ring) to chemical (adhesive-based). The pressure-sensitive adhesive provides immediate bonding upon contact, eliminating the need for tightening disks and elastic rings. This parameter change in the bonding mechanism resolves the reliability issue by using a material property (adhesive bonding) that does not deteriorate with aging.
2Reliability
If a pressure-sensitive adhesive layer is applied to the drive plate, then positional displacement is prevented through adhesion, but the adhesive force may be exerted during assembly causing assembly difficulties
Solution Approach 1:
The patent applies the pressure-sensitive adhesive layer to the outer circumferential surface of the drive plate in advance, before assembly. The adhesive is positioned and prepared beforehand on the drive plate, ensuring proper placement and activation only when the drive plate is inserted into the roller tube. This preliminary application prevents premature bonding during handling and assembly operations.
Solution Approach 2:
The pressure-sensitive adhesive layer is applied locally only to the outer circumferential surface of the drive plate where contact with the roller tube occurs. This localized application ensures adhesive force is exerted only at the interface between drive plate and roller tube, not across the entire assembly process. The adhesive remains inactive during handling and becomes active only upon insertion and contact with the roller tube.
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 solution effectively prevents positional displacement and facilitates easy assembly by maintaining adhesive force until the power transmission mechanism is fully integrated, ensuring reliable torque transmission and reducing assembly complexity.
Implementation Method 1
an adhesive force of the pressure-sensitive adhesive layer is exerted to adhere the outer circumferential surface of the first member or the second member and an inner circumferential surface of the roller tube to each other
Implementation Method 2
the diameter of the circumferential wall pressed by the tapered surface due to pressing by the screwing member expands
Data Source
AI summary
A motorized conveyor roller prevents slip between a power transmission mechanism in a roller tube and the roller tube due to aging. The power transmission mechanism includes a first closed-bottom cylindrical member fit over a second closed-bottom cylindrical member and a bolt for axially pressing the members against one another. The first member receives torque from a motor and a double-sided tape is laid on an outer surface of the first member. Facing surfaces of the first and second members are tapered, and the circumferential wall with the double-sided tape is expandable diametrically. The bolt diametrically expands the circumferential wall pressed by the tapered surface. Thus, an adhesive force of the double-sided tape sandwiched between the circumferential wall and the roller tube is exerted to adhere the outer surface of the first member to an inner surface of a roller tube.