Internal Expanding Brake Restoring Device with Torque Coupling
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Solution Overview
Problem
Existing actuating devices for internal expanding brakes require a two-part housing, high manual force for rotation, lack overload protection, and are limited to manual restoration without additional functions, making them complex and inefficient.
Innovation Solution
An actuating device with a restoring gear mechanism featuring a rotatable actuating pin and axially displaceable gearwheels, coupled via a torque-transmitting coupling device that provides overload protection and allows for easy manufacturing and mounting, enabling minimal force restoration and additional functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-part housing is used to mount the second gearwheel, then the restoring device can be assembled, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent merges the first gearwheel and second gearwheel into a single integrated gearwheel component. This eliminates the need for a two-part housing structure, simplifying the overall device assembly and reducing manufacturing complexity while maintaining the restoring function.
Solution Approach 2:
The single gearwheel serves multiple functions: it acts as both the first gearwheel (coupled to the actuating pin) and the second gearwheel (coupled to the adjusting nut), eliminating the need for separate components and simplifying the housing structure.
2Ease of operation
If the second gearwheel is rotated against the friction ring, then the adjusting nut can be restored, but increased manual force is required
Solution Approach 1:
The patent extracts the friction ring from the restoring path by designing the gearwheel to engage directly with the adjusting nut's thread without requiring rotation against the friction ring. This eliminates the resistance that previously required increased manual force.
Solution Approach 2:
The gearwheel acts as an intermediary mechanism that converts the actuating pin's linear movement into rotational movement of the adjusting nut without the interference of the friction ring, reducing the manual force required for restoration.
3Adaptability or versatility
If the restoring device is limited to manual restoration only, then the device structure remains simple, but additional functions like overload protection cannot be provided
Solution Approach 1:
The restoring device is designed to perform multiple functions: manual restoration of the adjusting pin and automatic overload protection. The same gearwheel mechanism serves both purposes, increasing versatility without significantly increasing structural complexity.
Solution Approach 2:
The restoring device provides self-protection through automatic overload protection. When excessive force is detected during restoration, the mechanism automatically prevents damage without requiring external intervention or additional complex 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
The solution simplifies the actuating device, reduces the need for a two-part housing, provides effective overload protection, and allows for efficient restoration with minimal force, while enabling additional functions and internal mounting.
Implementation Method 1
an actuating pin which is rotatably mounted in the housing and is configured for transmitting a torque applied manually to the actuating pin
Implementation Method 2
a restoring gear mechanism which has a first gearwheel coupled to the actuating pin and a second gearwheel coupled to the adjusting nut, in order to transmit the rotary movement of the actuating pin to the adjusting nut
Implementation Method 3
the rotation of the second gearwheel can only take place against the resistance of a friction ring cooperating with the second gearwheel
Data Source
AI summary
An actuating device for an internal expanding brake has a restoring device for manual adjusting and restoring of an adjusting pin relative to an expanding piston. The restoring device includes an actuating pin which is mounted rotatably in a housing and is configured for transmitting a torque which is applied manually to the actuating pin, and a restoring gear mechanism which has a first gearwheel which is coupled to the actuating pin and a second gearwheel which is coupled to an adjusting nut. The first gearwheel of the restoring gear mechanism which is coupled to the actuating pin can be displaced in the axial direction of the actuating pin and can be brought into and out of torque-proof engagement with the actuating pin by means of a coupling device in a manner which is dependent on the transmitted torque.