Transmission Guide With Integral Molded Base And Side Walls
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Solution Overview
Problem
Conventional transmission guides face issues such as chain straddling, side wall bending, and weak fused connections, leading to instability and potential breakage under load variations and eccentric chain positioning.
Innovation Solution
A transmission guide with an elongated synthetic resin shoe and base, integrally molded by two-member molding, featuring side walls that sandwich the shoe to enhance rigidity and prevent chain straddling, and indentations for improved lubrication and shear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shoe and base are assembled by hooks and notches, then the guide can be manufactured separately, but the connection strength is insufficient and hooks may break under stress
Solution Approach 1:
The patent merges the shoe and base into a single integrally molded component, eliminating the separate assembly of hooks and notches. This integration ensures that the shoe and base move as one unit, preventing relative movement and stress concentration at connection points, thereby solving the problem of hook breakage while maintaining manufacturing efficiency through integral molding.
Solution Approach 2:
The patent employs composite materials with different rigidity characteristics - a flexible shoe material for chain contact and a rigid base material for structural support. This composite structure allows the shoe to accommodate chain vibrations while the base maintains stable positioning, resolving the contradiction between manufacturing ease and connection strength.
2Device complexity
If the side wall of the shoe is low, then the guide structure is simpler, but the transmission chain can straddle and ride over the side wall
Solution Approach 1:
The patent extends the side walls of the base in the width direction beyond the shoe's side walls, creating a three-dimensional containment structure. This dimensional extension prevents the chain from straddling or riding over the guide by providing lateral constraints, thereby enhancing reliability without significantly increasing overall structural complexity.
3Stability of the object's composition
If the shoe has low rigidity, then the shoe can absorb vibrations, but the side wall can bend inward and contact the transmission chain
Solution Approach 1:
The patent applies local quality differentiation by making the shoe flexible for vibration absorption while the base rigid for shape maintenance. The shoe's lower rigidity allows it to absorb chain vibrations, while the base's higher rigidity prevents side wall bending, thereby resolving the contradiction between vibration absorption and side wall straightness.
4Ease of operation
If hooks are used to assemble shoe and base, then assembly is simple, but longitudinal movement occurs causing stress concentration and hook breakage
Solution Approach 1:
The patent eliminates the hook assembly by integrating the shoe and base into one piece. This merger removes the longitudinal clearance that causes stress concentration and hook breakage, while the integral structure maintains ease of installation as a single component, thereby resolving the contradiction between assembly simplicity and stress resistance.
Data Source
AI summary
A transmission guide comprises a synthetic resin shoe and a more rigid synthetic resin base, integrally molded by two-member molding. The base is formed with a pair of spaced, opposed, side walls extending in the direction of elongation of the base along opposite edges of a shoe-supporting surface of the base. These side walls engage respective side edges of the shoe, and extend past the front surface of the shoe so that they can restrict lateral movement of a transmission chain sliding along the front surface of the shoe. Indentations in the side walls receive protrusions formed on the edges of the shoe. Edges of the openings of the indentations are chamfered or convexly curved to avoid interference with the movement of the chain along the guide.