Chisel Support Element Centering Insert Design
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Solution Overview
Problem
Existing chisels and tool systems experience increased wear and reduced rotatability due to excessive axial play, leading to uneven wear patterns and reduced service life, as well as the penetration of excavated material into the chisel holder.
Innovation Solution
The design incorporates a support element with a centering shoulder and recess, where the ratio of the inner diameter of the receiving bore to the collar height is less than 8, providing radial stabilization and a labyrinthine seal, ensuring adequate lateral guidance and sealing, even under uneven axial loads, and preventing foreign substances from entering the chisel holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If axial play in the chisel holder is increased to allow rotation, then rotatability is improved, but lateral guidance is lost and wear increases
Solution Approach 1:
The patent introduces a new dimensional parameter - the collar height-to-inner-diameter ratio - to solve the contradiction between axial play and lateral guidance. By controlling the aspect ratio of the centering projection geometry, the invention creates a configuration where sufficient lateral guidance is maintained even with increased axial play for rotation.
Solution Approach 2:
The invention changes the geometric parameters of the centering projection, specifically the collar height and its ratio to the inner diameter of the receiving bore. This parameter optimization allows the system to tolerate greater axial play while maintaining adequate lateral guidance, resolving the contradiction between rotatability and guidance stability.
2Ease of operation
If axial play exceeds the centering boss height, then rotation freedom is improved, but wear of support element and chisel holder increases
Solution Approach 1:
The patent optimizes the collar height parameter of the centering projection relative to the inner diameter of the receiving bore. By maintaining an appropriate ratio between these dimensions, the invention allows sufficient axial play for rotation freedom while preventing excessive wear that would occur if the centering projection were too short.
3Ease of manufacture
If the ratio of inner diameter to collar height is increased, then ease of assembly is improved, but lateral guidance and sealing are compromised
Solution Approach 1:
The patent establishes an optimal range for the ratio between the inner diameter of the receiving bore and the collar height of the centering projection. This parameter control ensures that the centering projection provides sufficient lateral guidance and creates adequate sealing contact with the wear surface, while still allowing for practical assembly of the components.
Data Source
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AI summary
The invention relates to a chisel, in particular a round shank chisel, with a chisel head and a chisel shank, with a support element having a seat surface and a centering projection extending beyond the seat surface on its underside, wherein the centering projection has a centering surface inclined to the central longitudinal axis of the chisel, which transitions directly or indirectly into the seat surface, and wherein the support element is penetrated along the central longitudinal axis by a receiving bore with an inner diameter Di for receiving the chisel shank.It is provided that a collar height measured in the direction of the central longitudinal axis between an end of the centering projection facing away from the seat surface and the seat surface, or between the end of the centering projection and an inner end of a recess formed into the support element opposite the seat surface, is designed such that the ratio between the inner diameter Di of the receiving bore of the support element and the collar height is less than 8 and/or that the collar height is greater than an axial play of the chisel mounted in a chisel holder.