Wheel Balancer Locking Levers to Prevent Pawl Jamming
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Solution Overview
Problem
Existing wheel locking systems in balancing machines suffer from pawl wear, frequent failure, asymmetrical movement leading to imperfect fitting, and jamming due to misalignment, resulting in increased maintenance costs and component damage.
Innovation Solution
A locking apparatus with levers that rotate and translate, featuring offset apex positions and recessed surfaces to reduce stress and prevent jamming, coupled with a chamfered ratchet design to enhance compatibility and reduce mechanical forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If return rings are used to move pawls back inwards, then the locking mechanism can be reset, but the rings are subject to substantial wear and frequent failure
Solution Approach 1:
The patent removes the return rings from the system entirely, replacing them with a direct spring-loaded pawl mechanism. The springs are housed within the locking apparatus itself, eliminating the separate return rings that were causing wear and failure. This extraction of the problematic component while retaining the essential reset function resolves the contradiction between mechanism reliability and component service life.
Solution Approach 2:
The patent employs simple, replaceable springs instead of complex return rings. These springs are inexpensive, easy to replace, and designed for shorter service lives, allowing quick maintenance without replacing entire locking mechanisms. This approach accepts periodic component replacement as a trade-off for overall system reliability and reduced maintenance complexity.
2Reliability
If pawls are designed to move outwards to engage locking device, then locking function is achieved, but pawls tend to move non-symmetrically causing imperfect fitting
Solution Approach 1:
The patent introduces asymmetric features in the pawl design, including offset apex positions and chamfered edges that are not symmetrically arranged. These asymmetric elements guide the pawls into proper alignment during their outward movement, compensating for manufacturing variations and ensuring consistent engagement with the locking device cavities despite inherent asymmetries in movement.
Solution Approach 2:
The patent modifies geometric parameters of the pawls, such as the position of their apexes and the angles of their engagement surfaces. By carefully selecting these parameters, the design ensures that even with non-symmetric movement, the pawls achieve precise alignment and engagement with the locking device, transforming the problematic non-symmetric movement into an advantageous feature for self-alignment.
3Reliability
If pawls move outwards to engage locking device, then locking is achieved, but jamming occurs due to misalignment between pawls and cavities
Solution Approach 1:
The patent incorporates preliminary alignment features on the pawls, such as chamfered leading edges and guide surfaces, that prepare the pawls for engagement before they reach the locking cavities. This preliminary action ensures proper orientation and positioning, preventing misalignment and jamming during the critical engagement phase of the locking operation.
Solution Approach 2:
The patent designs the pawl-cavity interface with cushioning features that absorb misalignment shocks. The chamfered surfaces and spring-loaded mechanism provide a gradual, cushioned engagement rather than a hard impact, preventing jamming even when slight misalignments occur. This beforehand cushioning protects against the harmful effects of imperfect alignment.
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
An apparatus for locking a wheel in a balancing machine comprises: a first casing (2), extending along a working axis (D1); a second casing (3), disposed inside the first casing (2) and movable along the working axis (D1) relative to the first casing (2) to adopt an open position (PA) and a closed position (PC) which are spaced from each other along the working axis (D1); a first lever (4), hinged to the first end (3A) of the second casing (3) at a hinge (31) to rotate between an extracted position (PE1) and a retracted position (PR1); a second lever (5), hinged at the hinge (31) of the second casing (3) to rotate between a respective extracted position (PE2) and a respective retracted position (PR2). The first lever (4) and the second lever (5) include a respective first apex (41) and a second apex (51). When the second casing (3) is at the open position (PA), the first apex (41) and the second apex (51) are disposed at a corresponding first apex position. When the second casing (3) is at the closed position (PA), the first apex (41) and the second apex (51) are disposed at a corresponding second apex position. For both the first apex (41) and the second apex (51), the first apex position is further back than the second apex position in a locking direction (VB) along the working axis (D1).