Radial Brake Unit Arrangement for MRL Elevator Space Saving
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Solution Overview
Problem
Machine-room-less type elevator devices face challenges in achieving space saving in hoistways due to increased dimensions from the machine base to the ceiling, which restricts the vertical movement of the counterweight and hinders maintenance access, as existing configurations either increase the rail bracket's height or position the brakes on top of the hoisting machine.
Innovation Solution
The elevator device features a hoisting machine with a brake unit positioned higher than the machine base and lower than the upper rail bracket, allowing the machine base to be closer to the ceiling, and brake units that press against the brake drum in an oblique upward direction, enabling increased counterweight movement and maintaining access for maintenance personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rail bracket is arranged above the hoisting machine to support car guide rails, then the car guide rails can be properly supported, but the dimension from machine base to ceiling increases, reducing counterweight movement range
Solution Approach 1:
The brake unit is positioned in the radial direction of the hoisting machine, utilizing the horizontal space rather than increasing vertical dimension. This allows the rail bracket to be placed above the hoisting machine for proper support while the brake unit occupies lateral space, thus not increasing the machine base to ceiling dimension and preserving counterweight movement range.
2Device complexity
If the brakes are arranged on top of the hoisting machine, then the hoisting machine structure is simplified, but the dimension from machine base to ceiling increases, reducing counterweight movement range and limiting maintenance access
Solution Approach 1:
Instead of placing brakes on top of the hoisting machine (vertical arrangement), the brake unit is positioned in the radial direction (horizontal arrangement). This dimensional change allows the brakes to be integrated into the side profile of the hoisting machine, avoiding increase in vertical dimension and preserving counterweight movement range while also facilitating maintenance access from the car interior.
3Ease of repair
If the hoisting machine is positioned lower to enable maintenance access, then maintenance personnel can access the brakes, but the dimension from machine base to ceiling increases, reducing counterweight movement range
Solution Approach 1:
The brake unit is positioned radially outward from the hoisting machine shaft, making it accessible from the car interior without requiring the hoisting machine to be lowered. This radial positioning allows maintenance personnel to access the brakes from the side/rear of the hoisting machine while the machine remains in its optimal upper position, preserving counterweight movement range.
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 configuration allows for increased vertical movement of the counterweight, achieving space saving in the hoistway while ensuring adequate maintenance access and reducing the overall dimensions of the hoisting machine.
Implementation Method 1
a brake unit arranged at a position on a radially outer side of the brake drum, wherein the brake unit includes a movable member and presses the movable member in an obliquely upward direction against an outer peripheral surface of the brake dram to apply a braking force to the brake drum
Data Source
AI summary
Provided is an elevator device, in which a hoisting machine includes a main shaft, a brake drum rotatable about an axis of the main shaft, and a brake unit arranged at a position on a radially outer side of the brake drum. The brake unit includes a movable member and presses the movable member in an obliquely upward direction against an outer peripheral surface of the brake drum to apply a braking force to the brake drum. The car guide rail is retained by an upper rail bracket at a position higher than a position of the machine base. The brake unit is arranged at a position higher than the machine base and lower than the upper rail bracket.