Oil Wet Toothed Belt Tensioning Shoe Profile Optimization
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Solution Overview
Problem
Shoes with non-optimized longitudinal profiles in oil wet belt drives for internal combustion engines lead to increased power dissipation by friction, resulting in temperature increases and reduced active working life of the belt.
Innovation Solution
A shoe with an optimized geometry, featuring a contact surface defined by a single arc of circumference or a sequence of arcs with specific winding angles, is designed to reduce frictional power dissipation, maintaining durability requirements through precise control of the winding angle and take-up rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a shoe with non-optimised longitudinal profile is used, then the belt drive is compact and interchangeable with chain drive, but the power dissipated by friction increases and temperature increases deteriorating the belt
Solution Approach 1:
The patent applies parameter changes by optimizing the longitudinal profile of the shoe, specifically controlling the winding angle between 5-15 degrees and the take-up rate between 0.5-2.0 mm/degree. These parameter optimizations reduce the frictional contact between the shoe and oil wet belt, thereby reducing power dissipation and preventing excessive temperature increase that would deteriorate the belt material.
Solution Approach 2:
The patent implements local quality by creating a specific optimized contact zone on the shoe where the longitudinal profile is precisely engineered. The contact surface geometry is locally optimized with specific winding angles and take-up rates, while other parts of the shoe maintain their structural functions. This localized optimization reduces friction exactly where the belt contacts the shoe without compromising overall shoe functionality.
2Duration of action of moving object
If a shoe with non-optimised longitudinal profile is used, then the structure is simpler, but the active working life of the belt is reduced
Solution Approach 1:
The patent extends belt working life by optimizing geometric parameters of the shoe: winding angle (5-15 degrees) and take-up rate (0.5-2.0 mm/degree). These parameter changes reduce frictional heating and stress on the belt, preventing premature degradation. The optimized profile ensures uniform contact and reduces localized stress concentrations that would otherwise shorten belt life.
Solution Approach 2:
The patent utilizes curvature principles by defining the contact surface of the shoe with a specific longitudinal profile characterized by controlled winding angles. The curved geometry of the contact surface, rather than a straight or flat profile, distributes the contact pressure more evenly along the belt width and length, reducing stress concentrations and extending belt service life.
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 optimized shoe design significantly reduces power dissipation by friction, enhancing the operational life and durability of the belt drive while maintaining the same durability standards as chain drives, with a demonstrated reduction in dissipated power and improved thermal management.
Implementation Method 1
a shoe (5) having a contact surface (7) defined by a single arc of circumference or a sequence of arcs, characterised in that the shoe (5) is dimensioned such that a winding angle (α) is obtained
Implementation Method 2
there have recently been developed engines for motor vehicles comprising a timing belt having an oil wet belt
Data Source
AI summary
A drive for an internal combustion engine having a predetermined take-up rate (TU) and comprising a drive pulley, a driven pulley, a shoe and an oil wet toothed belt cooperating in contact with a guiding surface of the shoe, presenting an optimized winding angle (α) of the guiding surface to decrease the power dissipated on the toothed belt.