Hooking Lever Cam Assembly for Axial Backlash Recovery
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Solution Overview
Problem
Existing assemblies of rotating units and supports face issues with axial backlash due to the absence of a counterforce, leading to unreliable engagement and the need for large tolerances.
Innovation Solution
A hooking lever with a cam profile is used to recover axial backlash by engaging a surface during rotation, ensuring precise axial positioning through a hooking lever mechanism with a first and second lever part, allowing snap connections and force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no counterforce is applied to prevent axial movement of the rotating element, then the assembly structure is simpler, but axial backlash cannot be recovered and engagement reliability deteriorates
Solution Approach 1:
The cam profile is pre-formed on the hooking lever to automatically apply axial counterforce during the assembly process. As the hooking lever rotates into place, the cam profile automatically pushes the rotating element axially to eliminate backlash before final engagement, ensuring reliable connection without requiring external counterforce mechanisms.
Solution Approach 2:
The hooking lever performs dual functions: it both connects the rotating element to the support and simultaneously applies the necessary axial counterforce through its cam profile. The structure serves itself by integrating the backlash recovery mechanism into the assembly operation, eliminating the need for separate counterforce application devices.
2Ease of manufacture
If large axial backlash is accepted to achieve engagement, then the assembly process is easier, but the axial positioning precision deteriorates
Solution Approach 1:
The hooking lever transitions from a static connection element to a dynamic mechanism that actively adjusts axial positioning during assembly. The rotatable second lever part with cam profile dynamically applies varying axial forces throughout the assembly process, automatically compensating for dimensional variations and achieving precise positioning without requiring tight manufacturing tolerances.
Solution Approach 2:
The cam profile changes the axial position parameter of the rotating element during the assembly process. As the hooking lever rotates, the cam profile progressively adjusts the axial distance between the rotating element and support, transforming the positioning from a fixed initial state to a controlled final state with precise axial alignment.
3Manufacturing precision
If a hooking lever with cam profile is used to recover axial backlash, then axial positioning precision is improved, but the device complexity increases
Solution Approach 1:
The hooking lever merges multiple functions into a single integrated component: mechanical connection, axial backlash recovery through cam profile, and force transmission to the control device. By combining these functions in one element rather than using separate components, the design achieves precise axial positioning while minimizing overall device complexity.
Solution Approach 2:
The hooking lever is designed as a multi-functional element that performs connection, backlash recovery, and force transmission simultaneously. The cam profile on the second lever part enables the same component to serve both as a mechanical connector and as a positioning mechanism, reducing the need for additional specialized parts.
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 achieves precise axial positioning with narrow tolerances, enabling reliable engagement and coupling of the rotating unit to a control device.
Implementation Method 1
the second lever part is provided with a cam profile configured to engage a surface of the support during rotation from the initial mounting position to the final mounting position, so as to raise the hooking lever and the shaft with respect to said surface of the support, recovering any axial backlash between the rotating element and the support
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Assembly comprising a rotating unit (13, 20) and a support (11), wherein the rotating unit comprises a rotating element (13) and a hooking lever (20). The hooking lever (20) comprises a first lever part (21) mounted on an end (14a) of a shaft (14) of the rotating element (13) and is provided with a first clip (21d) configured to snap on a first hooking seat (14e) formed on an end (14a) of the shaft (14), and a second lever part (23) hinged to the first lever part (21). The second lever part (23) is provided with a second clip (23e) configured to snap on a second hooking seat (21g) formed on the first lever part (21). The second lever part (23) is provided with a cam profile (23g) configured to lift the hooking lever (20) and the shaft (14) relative to the support (11), recovering axial backlash between the rotating element (13) and the support (11). The second lever part (23) is provided with a force transmission portion (23a") configured to be coupled with a device for controlling the rotating element (13).