Digital Displacement Instrument Rotor Spring Engagement
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Solution Overview
Problem
Conventional digital displacement measuring instruments face challenges with rotary transmission errors due to inaccurate depth adjustment of the engaging key, which complicates assembly and impairs smooth spindle advancement and retraction.
Innovation Solution
A digital displacement measuring instrument featuring a rotor support member with a rotary piece and a biasing unit, where the engaging portion is pressed onto the engaging groove with a controlled force, eliminating the need for precise depth adjustment and facilitating easy assembly by allowing the rotor section to be installed without rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engaging key is firmly pressed onto the engaging groove to eliminate gaps, then rotation transmission error is reduced, but smooth advancement and retraction of the spindle is impaired
Solution Approach 1:
The engaging key is designed with dynamic characteristics through spring engagement, allowing it to adapt its position based on operational conditions. The spring enables the engaging key to maintain contact with the engaging groove while accommodating slight movements, thus preserving both transmission accuracy and operational smoothness.
Solution Approach 2:
The engagement force between the engaging key and engaging groove is made adjustable through the spring mechanism. This allows the system to optimize the balance between maintaining reliable rotational transmission and permitting smooth axial movement of the spindle, resolving the contradiction between these two requirements.
2Reliability
If the depth position of the engaging key is accurately adjusted to avoid gaps, then rotation transmission error is reduced, but assembly difficulty increases due to requiring very accurate work
Solution Approach 1:
The spring engagement mechanism enables the engaging key to self-adjust to the correct depth position during assembly. Rather than requiring precise pre-adjustment, the spring allows the engaging key to naturally settle into the appropriate position, significantly simplifying the assembly process while maintaining transmission accuracy.
Solution Approach 2:
The spring is pre-installed on the engaging key to provide the necessary engagement force before assembly. This preliminary preparation eliminates the need for complex depth adjustment procedures during assembly, as the spring automatically compensates for positioning variations.
3Reliability
If the engaging key is pressed toward the engaging groove using a plate spring, then rotation transmission error is reduced and assembly is facilitated, but workability for assembling the rotor section and engaging key onto the spindle deteriorates
Solution Approach 1:
The rotor support member is divided into distinct functional components: the engaging key with spring, the rotor support body, and the rotor section. This segmentation allows each component to be optimized independently and assembled in a straightforward sequence, improving overall assembly workability despite the added spring mechanism.
Solution Approach 2:
Instead of assembling the engaging key and spring separately onto the rotor support member, the spring is pre-mounted on the engaging key itself. This inverted assembly approach simplifies the overall process by reducing the number of separate assembly steps and improving workability.
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 solution reduces rotation transmission errors and enhances the workability of assembling the rotor section onto the spindle, ensuring smooth and accurate spindle movement with reduced assembly complexity.
Implementation Method 1
a biasing unit provided between the rotary piece and the rotor support member, the rotary piece is supported by the rotor support member in a manner circumferentially rotatable around a rotation shaft provided parallel to the axis of the spindle, and the biasing unit biases the engaging portion onto the engaging groove via the rotary piece
Data Source
AI summary
A rotation transmitter (44) includes a rotor support member (440) provided on an outer circumference of a spindle (2), a rotary piece (45) provided with an engaging portion (46) that is adapted to be engaged with an engaging groove (23), and a coil spring (48) provided between the rotary piece (45) and the rotor support member (440). The rotary piece (45) is supported by the rotor support member (440) in a manner rotatable in a circumferential direction of a rotation shaft (441) provided parallel to the axis of the spindle (2) and the coil spring (48) biases the engaging portion (46) onto the engaging groove (23) via the rotary piece (45).