Ripper Point Attachment Geometry to Prevent Shank Gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ripper point attachment structures for ripper devices experience gaps between the ripper point and shank due to repeated excavation, leading to wear and further gap formation, allowing earth or sand ingress.
Innovation Solution
The ripper point attachment structure features a ripper shank with a nose portion and linking portion of specific cross-sectional shapes, and a ripper point with corresponding internal space and cross-sectional configurations, ensuring precise fit and minimizing gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pin member is used to attach the ripper point to the ripper shank, then the attachment structure is simple and easy to manufacture, but gaps form between the ripper point and shank during repeated excavation
Solution Approach 1:
The nose portion is divided into multiple sections with different cross-sectional shapes (rectangular section, octagonal section, and tapered section). This segmentation allows each section to serve a specific function: the rectangular section provides initial positioning, the octagonal section prevents rotation and maintains alignment, and the tapered section ensures secure engagement. This segmented approach eliminates gaps while maintaining manufacturing feasibility through standard forging processes.
Solution Approach 2:
Different cross-sectional shapes are applied to different portions of the nose portion based on local functional requirements. The rectangular cross-section at the proximal end facilitates insertion and positioning, the octagonal cross-section in the middle section prevents rotational movement, and the tapered cross-section at the distal end ensures secure engagement. This local differentiation of geometric properties optimizes the attachment reliability without compromising ease of manufacture.
2Reliability
If the ripper point and shank are tightly fitted to prevent gaps, then gap formation is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The nose portion employs asymmetric cross-sectional shapes that progressively change along its length. The transition from rectangular to octagonal to tapered sections creates an asymmetric geometry that naturally guides the ripper point into proper alignment during insertion. This asymmetric design provides self-aligning features that reduce the need for high manufacturing precision while ensuring reliable gap prevention through consistent engagement geometry.
Solution Approach 2:
The tapered section of the nose portion introduces a curved geometric transition that facilitates smooth engagement between the ripper point and shank. This curved geometry allows for gradual alignment and reduces stress concentrations, enabling reliable attachment with moderate manufacturing tolerances. The curved transition also helps distribute loads more evenly, maintaining the tight fit without requiring excessive precision.
3Reliability
If earth or sand enters between the ripper point and shank, then wear accelerates and performance degrades, but preventing ingress requires more complex sealing structures
Solution Approach 1:
The octagonal cross-sectional section is designed to engage with corresponding features in the ripper point before final insertion is complete. This preliminary engagement creates a sealing interface that prevents earth and sand from entering the attachment interface during the excavation process. By establishing this protective barrier early in the engagement sequence, the design prevents contaminant ingress without requiring additional sealing components, thus avoiding increased device complexity.
Data Source
AI summary
A ripper point attachment structure in a ripper device includes a ripper shank including a main body portion and a nose portion, and a ripper point including an internal space. The nose portion includes a distal end portion, a proximal end portion contiguous with the main body portion, and a linking portion. An outer periphery of a cross section cutting the linking portion along a plane perpendicular to an axis extending in a lengthwise direction of the nose portion is formed in an octagonal shape. An outer periphery of a cross section cutting the proximal end portion along the plane is formed in a rectangular shape. An outer periphery of a cross section cutting the distal end portion along the plane is formed in a rectangular shape. An inner periphery forming the internal space is formed along an outer periphery forming the distal end, linking and proximal end portions.