Elastic Bushing Stopper for Gardening Tool Noise
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Solution Overview
Problem
Existing electrically powered gardening tools, such as hedge trimmers, experience contact noise and damage to elastic bushings due to heavy loads from hard tree branches or fine stones during trimming operations, as the connecting pins move within the speed-reduction gear's mounting holes, causing deformation and wear.
Innovation Solution
Incorporating a cylindrical stopper made of hard materials like stainless steel or synthetic resin within the mounting holes to restrict deformation of the elastic bushings, which are placed between the connecting pins and the speed-reduction gear, preventing collapse under heavy loads and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an elastic bushing is interposed between the connecting pins and mounting holes to reduce contact noise, then noise is reduced, but the bushing is damaged when heavy load is applied during trimming operation
Solution Approach 1:
A stopper is introduced as an intermediary component between the elastic bushing and the mounting hole. The stopper has a smaller diameter than the mounting hole and engages with the bushing to prevent excessive deformation. When heavy load is applied, the stopper restricts the bushing's deformation while still allowing it to function as a noise-reducing element during normal operation.
Solution Approach 2:
The elastic bushing is pre-installed in the mounting hole to provide cushioning and noise reduction before heavy loads occur. The bushing is designed to deform elastically under normal operating conditions, absorbing vibrations and reducing contact noise between the connecting pins and mounting holes.
2Ease of manufacture
If clearance is provided in the mounting holes to facilitate bushing installation, then ease of assembly is improved, but connecting pins move slightly causing contact noise
Solution Approach 1:
The elastic bushing serves as an intermediary element that fills the clearance between the connecting pins and mounting holes. This allows the mounting holes to remain large enough for easy assembly while the bushing eliminates the play and movement that would otherwise cause contact noise during 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 stopper effectively protects the elastic bushings from deformation and damage, reducing noise and maintaining tool functionality even when encountering hard materials, thereby enhancing the durability and performance of the gardening tool.
Implementation Method 1
an elastic bushing is disposed in a mounting hole formed in the speed-reduction gear or each eccentric disk plate of the crank-cam for engagement with the connecting pins fixed to the eccentric disk plate or the speed-reduction gear
Implementation Method 2
a stopper is provided to restrict deformation of the elastic bushing caused by load applied to the crank-cam
Data Source
AI summary
An electrically powered gardening tool of the type which includes a speed-reduction gear mounted in place to be driven by operation of an electric motor, a crank-cam in the form of overlapped eccentric disk plates fixed to a bottom surface of the speed-reduction gear by means of connecting pins for rotation therewith, and a pair of relatively reciprocating shear blades assembled with the eccentric disk plates. In the gardening tool, an elastic bushing is disposed in a mounting hole formed in the speed-reduction gear or each eccentric disk plate of the crank-cam for engagement with the connecting pins fixed to the eccentric disk plate or the speed-reduction gear, and a stopper is provided to restrict deformation of the elastic bushing caused by load applied to the crank-cam.