Belt Driving Device Deviation Prevention
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Solution Overview
Problem
Belt members in belt driving devices can suffer damage due to protrusions riding on rotary members, causing deviation and strong bending stresses, which existing configurations fail to adequately prevent.
Innovation Solution
A belt driving device design featuring an annular belt member with a protrusion along one edge and a contact member closer to the opposite edge, where the difference in positions between the protrusion contacting a rotary member and the belt member contacting a wall is equal to or less than the protrusion's width, preventing deviation and damage by synergistic contact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a protrusion is provided on the belt member to prevent deviation, then the belt member can be prevented from moving along the rotary member shafts, but the protrusion may ride on the rotary member causing strong bending stress and damage to the belt member
Solution Approach 1:
A contact member is introduced as an intermediary element between the belt member and the rotary member. The contact member contacts the belt member at a position closer to the first edge than the protrusion, preventing the belt from deviating without requiring the protrusion to ride on the rotary member, thereby eliminating the harmful bending stress while maintaining position stability
Solution Approach 2:
The contact member is positioned to act preliminarily by contacting the belt member before the protrusion can ride on the rotary member. This preliminary contact prevents deviation in advance, stopping the harmful sequence of events before it occurs and protecting the belt member from damage
2Stability of the object's composition
If the protrusion extends along the edge of the belt member to prevent deviation, then position control is improved, but the duration and impact of protrusion contact with the rotary member increases causing damage
Solution Approach 1:
The contact member serves as a mediator that takes over the deviation prevention function from the protrusion. By contacting the belt member at a different location, it eliminates the need for prolonged protrusion-contact interaction with the rotary member, reducing both duration and impact of harmful contact
Solution Approach 2:
The contact member provides sufficient (excessive) deviation prevention action at a specific location, making the protrusion's action unnecessary and too late. This partial action at the right location prevents the need for continuous or prolonged protrusion engagement with the rotary member
Data Source
AI summary
A belt driving device includes an annular belt member, rotary members, a protrusion, and a contact member. The belt member includes first and second edges. The belt member is wound around the rotary members. The protrusion protrudes from an inner peripheral surface of the belt member. The protrusion and each rotary member are arranged in an extending direction of the rotary member. The protrusion is provided at the second edge. The contact member is closer to the first edge. When the belt member deviates, the contact member comes into contact with the belt member. A difference between a position of the belt member when the protrusion comes into contact with an end surface of one of the rotary members and a position of the belt member when the belt member comes into contact with the contact member is equal to or less than a width of the protrusion.