PTO Guard Support Assembly for Stable Rotation and Low Wear
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Solution Overview
Problem
Existing safety guard supports for PTO and WAPTO joints do not securely mount the guard while allowing free rotation, leading to wear and instability.
Innovation Solution
A safety guard support mechanism featuring a bearing and retainer ring with interlocking formations, such as triangular teeth, that prevent rotation and allow lubrication, combined with a locking clip for secure longitudinal positioning, ensuring a stable and wear-reduced assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bearing is fitted to support the guard and allow rotation, then the guard can rotate freely with reduced wear, but the guard becomes unstable and prone to wear due to insufficient secure mounting
Solution Approach 1:
The retainer ring is divided into two separable halves that can be independently positioned and secured to the bearing. This segmentation allows the retainer ring to be installed without removing the bearing from the shaft, enabling free rotation while maintaining secure mounting through the distributed engagement of multiple teeth around the circumference.
Solution Approach 2:
The retainer ring halves are nested around the bearing, with each half engaging a portion of the bearing's outer surface through interlocking teeth. This nested configuration allows the retainer ring to securely hold the bearing in place while permitting rotational movement, resolving the contradiction between stability and free rotation.
2Reliability
If a releasable clip is used to secure the guard to the bearing, then axial movement is prevented, but rotation is restricted and wear increases
Solution Approach 1:
The retainer ring employs different engagement mechanisms at different locations: the teeth on the inner and outer circumferences provide rotational locking, while the splines or ridges on the axial surfaces prevent axial movement. This localized differentiation of engagement characteristics allows simultaneous achievement of rotational freedom and axial stability without the restrictions imposed by a simple releasable clip.
3Reliability
If the retainer ring is secured with multiple attachment screws, then rotational stability is improved, but the complexity of assembly and lubrication increases
Solution Approach 1:
The retainer ring is extracted from the traditional screw-secured design and replaced with a snap-fit configuration that engages the bearing through interlocking teeth and splines. This extraction of the fastening mechanism eliminates the need for multiple attachment screws, reducing assembly complexity while maintaining rotational stability through the distributed tooth engagement around the bearing circumference.
Solution Approach 2:
The interlocking teeth and splines on the retainer ring and bearing are designed to self-align and self-secure during assembly without requiring external fastening operations. The components engage automatically when the retainer ring halves are positioned around the bearing, eliminating the need for screw fastening and simplifying both assembly and subsequent lubrication maintenance.
Data Source
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AI summary
A safety guard support (20) for a power take off shaft, the safety guard support comprising:a bearing (30); and a retainer ring (24). The bearing and the retainer ring comprise corresponding interlocking formations (54) configured to prevent rotation of the bearing relative the retainer ring about a longitudinal axis.