Threaded Sprocket Adjuster for Precise Axial Chain Drive Alignment
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Solution Overview
Problem
Existing chain drives for round balers require laborious and time-consuming axial fine adjustments of freewheeling sprockets, especially those guided on rotary bearings, which are unsuitable for precise positioning and prone to loosening due to vibration.
Innovation Solution
A sprocket adjuster with a bearing journal featuring first and second external thread regions, allowing threaded nuts to clamp the rotary bearing, enabling precise axial displacement without spacer disks, and incorporating spacer elements or cup springs for anti-rotation and spring-preloaded adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional spacer disks are used for axial fine adjustment of sprockets, then adjustment capability is provided, but the process becomes very time-consuming and requires multiple mounting and demounting operations
Solution Approach 1:
The patent changes the adjustment parameter from discrete spacer disk thickness selection to continuous threaded nut rotation. The bearing journal is equipped with external thread regions that allow the threaded nut to be rotated, providing continuous axial displacement of the rotary bearing and sprocket. This transforms the adjustment process from a time-consuming discrete selection process to a quick continuous rotation process, resolving the contradiction between positioning precision and adjustment time.
Solution Approach 2:
The patent extracts the adjustment function from the spacer disk system and integrates it directly into the bearing journal through external thread regions. By removing the need for separate spacer disks and their associated mounting/demounting operations, the system achieves both precise positioning and rapid adjustment. The threaded nut directly engages with the bearing journal's thread regions, eliminating the intermediate spacer disk component and its complex handling requirements.
2Ease of operation
If freewheeling sprockets are guided on rotary bearings without clamping, then ease of movement is achieved, but the sprockets are prone to loosening due to vibration
Solution Approach 1:
The patent merges the mobility function and the clamping function into a single integrated system. The threaded nut simultaneously provides axial positioning (maintaining mobility) and clamping force (preventing loosening). By rotating the threaded nut, the operator can adjust the axial position while the friction from the threaded connection provides automatic clamping that prevents loosening during operation. This combines the benefits of ease of operation with reliability against vibration-induced loosening.
Solution Approach 2:
The threaded nut acts as an intermediary element between the bearing journal and the rotary bearing assembly. It mediates between the need for axial adjustability and the need for secure clamping. The threaded connection provides both the adjustment mechanism and the clamping force, serving as a mediator that reconciles the conflicting requirements of mobility and anti-loosening capability.
3Reliability
If shaft external toothing and hub internal toothing are used to connect sprocket and pressing roller, then form-fitting connection in rotation direction is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the form-fitting connection function from the complex shaft external toothing and hub internal toothing system and replaces it with a simpler keyed connection. The key fits into the keyway on the pressing roller shaft, providing the necessary form-fitting connection in the rotation direction without requiring the complex interlocking toothing structures. This extraction of the essential function (rotational connection) while removing unnecessary complexity (dual toothing systems) resolves the contradiction between reliability and ease of manufacture.
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
Facilitates quick and precise axial adjustment of sprockets, minimizing manufacturing effort and preventing loosening, thus improving operational stability and efficiency.
Implementation Method 1
The bearing journal has a first external thread region and a second external thread region. A first threaded nut is arranged on the first external thread region and a second threaded nut is arranged on the second external thread region, wherein the rotary bearing is clamped on the bearing journal between the external thread regions.
Implementation Method 2
A first spacer element is provided between the first threaded nut and a first end side of the rotary bearing facing the first threaded nut. A second spacer element is provided between the second threaded nut and a second end side of the rotary bearing facing the second threaded nut.
Implementation Method 3
In a further refinement, one or more cup springs are provided as spacer elements.
Data Source
AI summary
A sprocket adjuster for adjusting a sprocket of a chain drive includes a bearing journal, which includes a free end and a fixed end, a rotary bearing arranged on the bearing journal, and a sprocket guided on the rotary bearing. The bearing journal has a first external thread region and a second external thread region, wherein a threaded nut is arranged on each of the external thread regions and by means of which the rotary bearing is clamped on the bearing journal between the external thread regions.