Curved Treadmill Roller Clutch for One-Way Belt Motion
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Solution Overview
Problem
Existing treadmills face challenges in preventing reverse movement of the looped belt and in designing roller assemblies that allow rotation in one direction while preventing significant rotation in the opposite direction, as well as facilitating appropriate hand placement and foot placement for varying exercise intensity.
Innovation Solution
The design incorporates a one-way device comprising an inner and outer ring, where the inner ring is fixed to a stationary shaft and the outer ring is coupled to the roller tube, allowing rotation in one direction while preventing rotation in the opposite direction, and includes color-coded hand grip and foot placement positions to coordinate user intensity and step length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way clutch is installed on the roller assembly to prevent reverse movement of the looped belt, then the belt movement control is improved, but the device complexity increases
Solution Approach 1:
A one-way clutch is introduced as an intermediary component between the roller assembly and the frame. The clutch allows the roller to rotate freely in the forward direction (front to rear) while preventing rotation in the reverse direction (rear to front), thus controlling belt movement without requiring complex mechanical constraints on the roller assembly itself.
Solution Approach 2:
The roller assembly is designed with dynamic characteristics where the roller can rotate freely in the forward direction to allow natural belt movement, but the one-way clutch dynamically locks the roller when reverse movement is detected. This dynamic behavior provides reliable belt control while maintaining simplicity in the forward motion path.
2Ease of operation
If the roller tube is allowed to rotate freely to facilitate belt movement, then the ease of operation is improved, but the ability to prevent reverse movement deteriorates
Solution Approach 1:
The one-way clutch serves as a mediator between the freely rotating roller tube and the fixed frame. It permits unrestricted rotation in the forward direction, ensuring ease of operation for belt movement, while simultaneously blocking rotation in the reverse direction to maintain reliability of reverse movement prevention.
3Ease of operation
If color-coded hand grip and foot placement positions are added to coordinate user intensity and step length, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
Different sections of the handlebar and treadmill belt are marked with different colors corresponding to specific exercise intensities and step lengths. For example, different colored zones on the handlebar indicate different gripping positions for varying intensity levels, while corresponding colored sections on the belt indicate appropriate foot placement areas. This visual guidance system improves ease of operation by intuitively guiding users without adding complex mechanical or electronic control systems.
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
This solution effectively restricts reverse belt movement and enhances user coordination, allowing for varied exercise intensity by ensuring the belt moves from front to rear while preventing movement from rear to front, and aids in proper hand and foot placement for different exercise levels.
Implementation Method 1
The one-way device comprises an inner ring and an outer ring, the inner ring being fixedly coupled to the first shaft not to rotate on the first shaft, the outer ring is fixedly coupled to the roller tube to allow the roller tube to rotate in a first direction around the first shaft and to prevent the roller tube from rotating around the first shaft in a second direction that is opposite to the first direction
Data Source
AI summary
A treadmill has a front or rear set of pulleys and a looped running belt. The pulleys rotate with the movement of the belt, e.g., when a user walks, jogs, or runs on the treadmill. The pulleys are mounted on a rotating roller tube so that the roller tube rotates with the pulleys. The roller tube is mounted on a stationary shaft using bearings on each side and a one-way device that allows the pulleys to rotate in one direction. The rotation direction corresponds to the movement of the top of the belt from the front to the rear of the treadmill. The one-way device prevents the pulleys from rotating in the opposite direction, preventing the top of the belt from moving from the rear of the treadmill to the front. The one-way device may be a sprag clutch. The treadmill may be a motor-less, curved treadmill.