Torque Receiving Assembly Axial Stability Mechanism
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Solution Overview
Problem
The ball-type universal joint in torque receiving assemblies for laser printers is prone to detachment during transportation, leading to instability and loss of transmitting function.
Innovation Solution
A torque receiving assembly with a driven shaft and a distance-limiting mechanism, including a retaining cover and an urging spring, that allows reciprocal movement in the axial direction, ensuring the driven shaft is securely fixed to the body, preventing detachment and maintaining stability during rotational force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a ball-type universal joint is used for torque transmission, then the structure is simple and easy to manufacture, but the joint becomes easily detachable during transportation, leading to instability
Solution Approach 1:
The universal joint is segmented into a body portion and a driven shaft portion that can move relative to each other in the axial direction. This segmentation allows the joint to accommodate transportation shocks while maintaining connection through the distance-limiting mechanism, resolving the contradiction between simple structure and stability.
Solution Approach 2:
The driven shaft is designed to move dynamically in the axial direction relative to the body, with its position limited by the distance-limiting mechanism. This dynamic design allows the joint to absorb transportation shocks while maintaining reliable torque transmission, improving stability without compromising ease of manufacture.
2Reliability
If the driven shaft is fixed rigidly to the body, then stability is improved, but the ability to accommodate axial movement and shocks is reduced
Solution Approach 1:
The driven shaft is designed to move dynamically in the axial direction relative to the body, with its position limited by the distance-limiting mechanism. This dynamic design allows the joint to absorb transportation shocks while maintaining reliable torque transmission, improving stability without compromising ease of manufacture.
Solution Approach 2:
The connection between the driven shaft and body is established not only in the radial direction (for torque transmission) but also in the axial direction (with controlled movement). This multi-dimensional connection provides both stability and adaptability to axial shocks, resolving the contradiction between rigid fixation and shock accommodation.
3Reliability
If a distance-limiting mechanism is added to prevent detachment, then reliability is improved, but device complexity increases
Solution Approach 1:
A distance-limiting mechanism acts as an intermediary between the driven shaft and the body, controlling their relative axial movement. This intermediary component prevents detachment while allowing controlled movement, improving reliability without requiring complete rigid fixation or complex coupling mechanisms.
Solution Approach 2:
The distance-limiting mechanism is designed to automatically limit the axial movement of the driven shaft without requiring external control systems. The mechanism self-regulates the position of the driven shaft, preventing detachment while maintaining simplicity and avoiding additional complexity in control and operation.
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 provides a reliable and stable torque transmission, ensuring the photosensitive drum and process cartridge maintain stability and functionality during operation.
Implementation Method 1
an urging spring, which pushes the output arm
Implementation Method 2
a retaining cover, which retains the driven shaft
Data Source
AI summary
A torque receiving assembly, a photosensitive drum and a process cartridge having such torque receiving assembly. The torque receiving assembly having a body having an axis and having an accommodating chamber; a driven shaft disposed coaxially with the body, the driven shaft including a guide stem and a coupling head provided at one axial end of the guide stem, the guide stem having a pair of output arms which extend outwardly in a radial direction, the coupling head having a plurality of projections; wherein a pair of input arms are provided at an inner wall of the accommodating chamber and configured for abutting with the output arms; the guide stem is movable in the axial direction relative to the body, the torque receiving assembly further has a distance-limiting mechanism that defines a maximum distance the driven shaft is able to move relative to the body in the axis direction. The photosensitive drum and process cartridge according to the present invention both include the torque receiving assembly.