Symmetric Elevator Disc Brake Structure for Lower Machinery Load
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Solution Overview
Problem
Existing elevator braking devices face limitations in cost, complexity, and operational efficiency, with cheap block brakes imposing high loads on machinery and disc brakes being too expensive for cost-sensitive environments, failing to meet application needs effectively.
Innovation Solution
An elevator braking device with a brake disc having opposite sides, featuring a body, support member, guide member, and friction members, utilizing a control portion with electromagnetic and elastic components to manage braking states, reducing component complexity and cost while ensuring efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a block brake is used to reduce cost, then manufacturing cost is reduced, but the load on motor rotor and bracket increases
Solution Approach 1:
The brake friction member is divided into two separate friction surfaces (first friction surface and second friction surface) that act on opposite sides of the brake disc. This segmentation allows the braking force to be distributed symmetrically, reducing the net load on the motor rotor and bracket while maintaining effective braking capability.
Solution Approach 2:
The brake structure uses a symmetrical design where the first friction member and second friction member apply equal and opposite forces on the brake disc. This counterbalancing approach cancels out the reaction forces, reducing the overall load on the motor rotor and bracket compared to single-sided block brakes.
2Force
If a disc brake is used to reduce load on machinery, then load on equipment is reduced, but device complexity and price increase
Solution Approach 1:
The patent combines the advantages of disc brakes (symmetrical braking, reduced load) with a simplified structure. The brake friction member integrates both friction surfaces on a single component that can pivot or move as one unit, reducing the number of separate parts compared to traditional disc brake assemblies while maintaining the load-reducing symmetrical force application.
Solution Approach 2:
The brake friction member serves multiple functions: it provides braking contact on both sides of the disc, acts as a lever arm for the actuating force, and transmits the braking force symmetrically to reduce load on the motor. This multi-functionality reduces the need for additional components, simplifying the overall structure.
3Device complexity
If a block brake with one-way braking pressure is used, then structure is simplified, but reaction force exerts large load on motor rotor
Solution Approach 1:
Instead of applying braking force from one side of the brake disc, the patent inverts the approach by applying friction forces from both sides simultaneously. The first friction member contacts the first side of the brake disc while the second friction member contacts the second side, creating symmetrical opposing forces that cancel out the reaction force on the motor rotor.
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 solution effectively reduces component count, saves space, lowers costs, and ensures reliable performance, making it suitable for various elevator environments and expanding its application scope.
Implementation Method 1
the electromagnetic member provides an electromagnetic force to overcome the acting force and move the moving member towards the fixed member
Implementation Method 2
the first force supply member provides an acting force to the moving member to move it towards the first side
Implementation Method 3
the first friction member moves along the guide member under control of the control portion to be in contact with the first side to perform a braking operation
Data Source
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AI summary
The disclosure relates to an elevator braking device and an elevator system. The elevator braking device is used for performing braking operations on an elevator driving device comprising a brake disc (20) and it has a first state and a second state, and comprises: a body (10), with its interior accommodating at least a part of the brake disc (20), and a support member (30) axially fixed relative to the brake disc (20); a guide member (15) connected to the support member (30), wherein the body (10) is movable relative to the brake disc (20) along the guide member (15); a first friction member (11) and a control portion which are arranged inside the body (10) and adjacent to a first side (21) of the brake disc, wherein a part of the control portion is connected to the body (10), and the first friction member (11) moves along the guide member (15) under control of the control portion to be in contact with the first side (21) to perform a braking operation in a first state, and to be out of contact with the first side (21) in a second state, respectively; and a second friction member (12) arranged inside the body (10) and adjacent to a second side (22) of the brake disc (20), wherein the second friction member (12) is connected to the body (10) and is in contact with the second side (22) to perform a braking operation in the first state, and is out of contact with the second side (22) when the body (10) is moved along the guide member (15) as the first friction member (11) is out of contact with the first side (21) in the second state.