Energy-Storing Mechanism With Isosceles Loading Cam
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Solution Overview
Problem
Conventional on-load tap changing devices with energy-storing units face challenges in maintaining stable operation due to high loading torque requirements, which necessitate precise manufacturing and increased costs, especially when disturbances occur, leading to insufficient crank rotation and failure to engage the catch with the crank.
Innovation Solution
The energy-storing unit incorporates a forcing mechanism with a protrusion, bearing, and isosceles triangular loading cam, where the loading cam contacts the bearing to rotate the crank and move the catch to the standby position, maintaining constant contact point distance from the eccentric cam's rotation center, reducing loading torque and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional forcing mechanism with a loading cam is used to move the catch to the standby position, then the catch can be engaged with the crank, but the loading torque becomes excessively high requiring precise manufacturing
Solution Approach 1:
The patent changes the geometric parameters of the loading cam, specifically designing it with an isosceles triangular shape where the contact point between the cam and bearing maintains a constant distance from the eccentric cam's rotation center. This parameter optimization reduces the loading torque to approximately one-third of conventional mechanisms, eliminating the need for high-precision manufacturing while ensuring reliable catch engagement
Solution Approach 2:
The loading cam is designed to maintain a constant potential (constant distance from rotation center) at the contact point with the bearing throughout its rotation. This equipotential design ensures that the loading torque remains constant and low, avoiding the torque spikes that would require precise manufacturing controls
2Reliability
If high loading torque is required for the forcing mechanism, then the catch can be moved to standby position, but the manufacturing complexity and costs increase
Solution Approach 1:
By optimizing the loading cam's geometric parameters (isosceles triangular shape with specific vertex angle and dimensions), the mechanism achieves reliable catch positioning with reduced loading torque, simplifying both the mechanism design and manufacturing processes while maintaining functional effectiveness
Solution Approach 2:
The loading cam is designed as a simple, easily manufacturable component with a standard isosceles triangular profile that can be produced through conventional machining without requiring high-precision tools or complex manufacturing processes, reducing overall device complexity and cost
3Reliability
If the crank rotation amount is insufficient due to disturbance, then the catch does not reach standby position, but increasing torque requirements worsen manufacturing precision needs
Solution Approach 1:
The loading cam parameters are specifically designed to generate sufficient torque even under disturbed conditions to ensure the crank completes its rotation and the catch returns to the standby position. The constant-distance contact point design ensures this torque is delivered efficiently without requiring high manufacturing precision
Solution Approach 2:
The forcing mechanism with the optimized loading cam is designed to preemptively correct any insufficient crank rotation caused by disturbances. By maintaining a constant, optimized loading torque through the isosceles triangular cam profile, the system ensures the catch is forcibly returned to the standby position before the next operation cycle begins
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 design significantly reduces loading torque, allowing stable operation without precise components, simplifying manufacturing, and enhancing cost performance by maintaining reliable engagement of the catch with the crank, even under disturbances, thus ensuring efficient spring force storage.
Implementation Method 1
the spring is accumulating spring force along with the linear motion of the hoist case 12
Implementation Method 2
an eccentric cam 11 is attached to the drive shaft 10... the eccentric cam 11 reciprocates linearly in synchronization therewith
Implementation Method 3
the spring releases the spring force, and thus the energy-storing case 13 moves linearly at fast speed due to the spring force by the spring, and, the crank 14 in synchronization with the energy-storing casing 13 rotates at fast speed
Data Source
Figure 1
Figure 2
Figure 3A~3F
AI summary
There are provided an energy-storing unit with a forcing mechanism and an on-load tap changing device provided with the same which employ an inexpensive and simple structure and which can suppress a loading torque to operate stably. A forcing mechanism built in an energy-storing unit includes a protrusion 8, a bearing 9, and a loading cam 17. Among those components, the protrusion 8 is attached to the bottom face of an eccentric cam 2, and the bearing 9 is attached to the tip of the protrusion 8. The loading cam 17 is an isosceles triangle having a vertex that is substantially 90 degrees, and is attached to the top face of an energy-storing case 5. The loading cam 17 becoming in contact with the bearing 9 causes a crank 6 to rotate through the energy-storing case 5, and feeds a catch 7 to a standby position.