Elevator Guide Axis Alignment with Traction Members
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Solution Overview
Problem
Traction elevator systems face limitations in weight capacity and ride quality due to the positioning of guides and traction members, which prevents additional traction members from being added and disrupts the alignment with guide rails, reducing the system's duty and ride quality.
Innovation Solution
The elevator system rearranges guides to be below the sheaves and traction members, allowing for vertical alignment with guide axes, enabling the addition of extra traction members and improving alignment with guide rails, thereby increasing the weight capacity and ride quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guides are positioned above sheaves and traction members, then guides can engage with guide rails, but additional traction members cannot be added and alignment with guide rails is disrupted
Solution Approach 1:
The guide is repositioned from a horizontal arrangement (above sheaves) to a vertical arrangement (below sheaves), allowing the traction member to extend vertically through the guide's location. This dimensional change enables both the guide to engage with the guide rail and the traction member to align with the guide axis, resolving the conflict between these two requirements.
2Ease of operation
If guides are positioned to engage with guide rails, then the elevator car can be guided, but the weight capacity is reduced due to limited traction members
Solution Approach 1:
By changing the guide's position from above to below the sheaves, the system allows the traction member to extend vertically through the guide's location. This enables additional traction members to be added without interfering with the guide's engagement with the guide rail, thereby increasing the elevator car's weight capacity while maintaining guiding functionality.
3Ease of operation
If guides are positioned above sheaves, then guides can engage with guide rails, but ride quality is reduced due to misalignment with traction members
Solution Approach 1:
The guide is repositioned from a horizontal location (above sheaves) to a vertical location (below sheaves), allowing the traction member to extend vertically through the guide's position. This alignment ensures that the guide and traction member share a common vertical axis, improving ride quality by eliminating misalignment while maintaining effective guiding.
Data Source
AI summary
An elevator car assembly includes a car frame, a car connected to the car frame and having a first guide axis between a first side and a second side of the car frame, a plurality of traction members, a first plurality of sheaves rotatably connected to the car frame between the first side and the second side for respectively receiving the plurality of traction members, and a first guide attached to either the car frame or the car below the first plurality of sheaves for movably engaging a first rail. The first guide is aligned with the first guide axis and is configured to be aligned with the first rail. One of the plurality of traction members and the first guide are vertically aligned at the first guide axis.