Rotary Shaft Clamp Structure for Thrust-Free Positional Accuracy
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Solution Overview
Problem
Existing disk-based rotary shaft clamp devices face challenges in maintaining positional accuracy due to thrust forces generated when press-contact force is applied from one side of the disk, and they often require complex structures with multiple parts and increased installation space to cancel these forces.
Innovation Solution
A rotary shaft clamp device with a pair of annularly formed contact surfaces and a press-contact member that comes into contact with the inner side of each contact surface, eliminating thrust forces and simplifying the structure by reducing the number of parts and installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If press-contact force is applied from one side of the disk, then restraining force is enhanced, but thrust force is generated affecting positional accuracy
Solution Approach 1:
The invention uses asymmetric positioning of the press-contact member relative to the disk, placing it closer to one contact surface than the other. This asymmetric arrangement allows the press-contact member to effectively restrain rotation while the opposing contact surfaces balance the thrust forces, preventing axial displacement and maintaining positional accuracy.
2Manufacturing precision
If press-contact force is applied from opposite surface sides of the disk, then displacement in rotation center axis direction is reduced, but number of parts and installation space increase
Solution Approach 1:
The invention merges the functions of multiple contact surfaces and pressing mechanisms into a single integrated press-contact member. The press-contact member simultaneously contacts both opposite surfaces of the disk through its dual-sided configuration, combining the thrust-balancing function into one component rather than requiring separate mechanisms on each side.
Solution Approach 2:
The press-contact member serves multiple functions: it provides restraining force through friction contact, balances thrust forces by contacting both disk surfaces, and maintains positional accuracy. This multi-functional design eliminates the need for separate components dedicated to each function, simplifying the overall structure.
3Force
If distance from rotation center to restraining position is increased, then restraining force is enhanced, but installation space increases
Solution Approach 1:
The invention transitions from a single-plane contact arrangement to a three-dimensional configuration where the press-contact member extends across both sides of the disk. By utilizing the axial dimension (depth of the disk), the system achieves enhanced restraining force through increased lever arm distance without proportionally increasing the radial footprint or installation space.
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 ensures both restraining force and positional accuracy with a simplified structure, as the press-contact member evenly distributes contact force across the contact surfaces, eliminating thrust forces and maintaining precise rotational positioning.
Implementation Method 1
a diaphragm-based displacement mechanism is brought into press-contact with an outer periphery of the rotary shaft to frictionally apply a brake
Data Source
AI summary
A rotary shaft clamp device configured to clamp a first member to a second member, the first and second members being relatively rotatable around a predetermined center axis, the rotary shaft clamp device including: a pair of contact surfaces annularly formed in an outer periphery of a disk provided for a rotary shaft that is a first member at a predetermined distance from the center axis and opposed to each other at a regular interval; and a press-contact member that is supported by a support body that is a second member and is configured to come into press-contact with the pair of contact surfaces, the press-contact member having a pair of surfaces located between the pair of contact surfaces to face the contact surfaces, the pair of surfaces being configured to advance in directions along the center axis.