Rotary Clamp Stop Mechanism for Precise Output Rod Positioning
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Solution Overview
Problem
Conventional rotary clamps face issues with accurately stopping the output rod at a given position due to inertial forces and abrasion, leading to misalignment and increased engagement gaps between components.
Innovation Solution
A rotary clamp design featuring a piston and output rod with a biasing mechanism, guide grooves, and engaging members that allow precise axial movement conversion to rotary movement, ensuring the output rod is absolutely stopped at a specific position through a converting mechanism and detection valve system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stepwise part of the output rod is roughly caused to be in contact with the lower end part of the lock spring, then the output rod can be stopped, but the output rod is stopped at a position beyond the given position in the circumferential direction due to inertial force
Solution Approach 1:
The guide groove is designed with a stopping part at its end in the circumferential direction. The engaging member on the output rod is guided by the guide groove and contacted by the stopping part before the inertial force can cause excessive rotation. This preliminary constraint prevents the harmful effect of inertial force from occurring.
Solution Approach 2:
The guide groove acts as an intermediary element between the engaging member and the stopping part. It guides the engaging member along a predetermined path and ensures that the stopping action occurs at the correct position, mediating the interaction between the moving output rod and the stationary housing.
2Reliability
If abrasion of the rotary groove, actuation groove, or driving ball occurs, then the engagement gap increases, but the output rod is stopped at a position beyond the given position in the circumferential direction
Solution Approach 1:
The stopping function is extracted from the helical groove system and implemented separately through the guide groove with its stopping part. This separates the rotational drive function (which undergoes abrasion) from the positioning function (which requires precision), so that wear in the rotary groove and actuation groove does not affect stopping position accuracy.
3Ease of operation
If the engaging member is not constrained in the circumferential direction, then the output rod can rotate freely, but the output rod cannot be absolutely stopped at a given position
Solution Approach 1:
The guide groove provides dynamic constraint - it allows the engaging member to move freely along the groove path during rotation, but provides a hard stop at the end of the groove in the circumferential direction. This dynamic behavior enables both free rotation during operation and absolute stopping at the predetermined position.
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 design enables absolute stopping of the output rod at a predetermined position, preventing misalignment and maintaining engagement gap dimensions, thus ensuring accurate positioning and operation.
Implementation Method 1
A compression spring is disposed between a lower end part of the output rod and a bottom wall of the housing hole
Implementation Method 2
A lock spring is disposed on an upper side of the piston, and a lower end part of the lock spring is caused to be in contact with the upper surface of the piston
Implementation Method 3
An actuation groove is helically provided on an inner circumferential wall of the housing hole, and a rotary groove is provided on the outer circumferential wall of the lower part of the output rod so that the rotary groove faces the actuation groove. A driving hall is inserted between the actuation groove and the rotary groove.
Data Source
AI summary
A piston (4) is inserted in a housing (1) so that the piston (4) is vertically movable. A housing hole (5) is vertically provided in the piston (4), and an output rod (6) is inserted in the housing hole (5) so that the output rod (6) is vertically movable. A converting mechanism (22) converts vertical movement of the piston (4) into rotary movement of the output rod (6). A guide groove (28) is provided in a circumferential direction on an inner circumferential wall of the housing hole (5), and a stopping part (29) is provided at an end part, in the circumferential direction, of the guide groove (28). An engaging member (31) which is provided on an outer circumferential wall of the output rod (6) is caused to face the stopping part (29) of the guide groove (28) at a given distance in the circumferential direction from the stopping part (29) so that the engaging member (31) can be in contact with the stopping part (29).