Surveying Instrument Whirl-Stop Unit Eccentricity Compensation
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Solution Overview
Problem
Conventional surveying instruments face issues with eccentricity between the vertical rotation shaft and the motor due to dimensional and mounting errors, which are typically addressed using bulky couplings that occupy space and limit component placement.
Innovation Solution
A surveying instrument design featuring a whirl-stop unit and a vertical rotation driving unit with a specific friction torque mechanism and a whirl-stop unit that absorbs eccentricity, allowing for compact integration and accurate rotation without the need for bulky couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling is provided at the connecting portion between the motor output shaft and the rotation shaft, then the eccentricity between the motor and the rotation shaft is absorbed, but the motor and its peripheral part become bulky and the space in the frame is narrowed
Solution Approach 1:
The invention extracts the eccentricity absorption function from the coupling and relocates it to a whirl-stop unit positioned outside the frame. This separates the space-consuming coupling from the compact motor assembly, maintaining eccentricity compensation while preserving internal frame space for other components.
Solution Approach 2:
The whirl-stop unit acts as an intermediary mechanism between the motor assembly and the frame. It provides the necessary eccentricity absorption capability through a separate, external structure rather than requiring a bulky coupling at the motor connection point.
2Stability of the object's composition
If a coupling is provided to absorb eccentricity, then the motor and rotation shaft connection is stabilized, but the structure becomes more complex and other components cannot be provided in the frame
Solution Approach 1:
The invention extracts the eccentricity absorption function from the motor coupling system and places it in an external whirl-stop unit. This simplifies the internal motor-rotation shaft connection structure while maintaining connection stability through the separate whirl-stop mechanism.
Solution Approach 2:
The solution moves the eccentricity absorption mechanism from the internal coupling dimension to an external dimension via the whirl-stop unit. This spatial reconfiguration reduces structural complexity within the frame while maintaining connection stability.
3Manufacturing precision
If dimensional error or mounting error occurs between the motor output shaft and the rotation shaft, then eccentricity is generated, but providing a coupling to absorb it increases the overall size
Solution Approach 1:
The invention extracts the tolerance compensation function from the motor coupling and relocates it to an external whirl-stop unit. This allows the motor assembly itself to remain compact while the external unit handles the dimensional and mounting error compensation.
Solution Approach 2:
The invention segments the eccentricity absorption function from the motor assembly and places it in a separate whirl-stop unit. This functional segmentation allows the motor to maintain its compact size while the separate unit provides the necessary tolerance compensation.
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 absorbs eccentricity, maintains rotation accuracy, and conserves space within the instrument, enabling precise angle and distance measurements while reducing the complexity of motor mounting requirements.
Implementation Method 1
a vibration generating component provided on an outer circumferential portion of the intermediate fixed plate
Implementation Method 2
the rotating plate is in close contact with the vibration generating component via a first friction component by a pressing force from the output-shaft pressing component
Implementation Method 3
is in close contact with the output flange via a second friction component generating a friction torque smaller than the friction torque of the first friction component
Implementation Method 4
a ball holder having a steel ball accommodated in the hole portion and pressed by a steel-ball pressing component
Data Source
AI summary
The invention provides a surveying instrument, which comprises a frame unit provided capable of rotating horizontally via a horizontal rotation shaft, a telescope unit provided capable of rotating vertically via a vertical rotation shaft in a recessed portion formed in the frame unit, a vertical rotation driving unit in which a vertical output shaft is connected to the vertical rotation shaft, and a whirl-stop unit provided on an outer side of a side plate of the frame unit along the side plate and connecting the vertical rotation driving unit and the frame unit to each other.