Rockable Blade Mounting for Lawn Mower Wear Reduction
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Solution Overview
Problem
In robotic lawn mowers, the thin cutting blade pieces experience wear and deformation due to resistance from the lawn, leading to frequent replacement of consumable components and potential damage from twined grass and obstacles.
Innovation Solution
A lawn mower design featuring a rockably mounted cutting blade piece on a bladed disk with a cylindrical member and axial bolt configuration, where the axial member is inserted into the cylindrical member with a space, providing a wider surface contact area and reducing wear, and a retaining ring to secure the blade, preventing grass intrusion and obstacle-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If axial bolts and nuts are used to fix cutting blade pieces to the bladed disk, then the cutting blade pieces can be mounted and operated, but the inner edges of the mounting holes experience high contact pressure and wear, making the axial bolts and nuts consumable components that require frequent replacement
Solution Approach 1:
A cylindrical member is introduced as an intermediary component between the axial bolt and the cutting blade piece. The axial bolt is inserted into the cylindrical member with a space between them, and the cutting blade piece is fixed to the outer periphery of the cylindrical member. This intermediary structure distributes the contact pressure over a larger area and prevents direct slide contact between the mounting hole inner edge and the axial bolt, thereby reducing wear and improving durability of the mounting components.
2Manufacturing precision
If the cutting blade pieces are thin to achieve precise cutting, then cutting precision is improved, but contact pressure at the mounting holes increases and wear occurs more rapidly
Solution Approach 1:
The cylindrical member serves as a mediator that supports the thin cutting blade piece without requiring thickening of the blade. By fixing the blade to the outer periphery of the cylindrical member rather than directly to the axial bolt, the structure maintains the thin profile of the blade for precision cutting while distributing mounting stresses through the cylindrical member, thereby improving durability without compromising cutting precision.
3Productivity
If work is continued for a long time, mowed grass and dust intrude into the spaces between axial bolts and mounting hole inner edges, causing grass to twine around the axial bolts and fix the cutting blade pieces, but this prevents the blade from escaping obstacles and causes deformation and damage
Solution Approach 1:
The cylindrical member acts as a physical barrier and intermediary structure that prevents mowed grass and dust from intruding into the space between the axial bolt and the mounting hole inner edge. By fixing the cutting blade piece to the outer periphery of the cylindrical member, the structure eliminates the narrow gaps where grass could twine and cause fixation, thereby preventing deformation and damage while maintaining continuous work capability.
4Adaptability or versatility
If the cutting blade pieces are rockably mounted to allow escape from obstacles, then flexibility and damage prevention are improved, but the blade pieces rock around the axial bolts causing wear and contact pressure
Solution Approach 1:
The cylindrical member serves as an intermediary that allows the cutting blade piece to rock or move relative to obstacles while preventing direct contact between the axial bolt and the mounting hole inner edge. The blade is fixed to the cylindrical member's outer periphery, so when the blade rocks during obstacle escape, the movement occurs around the cylindrical member rather than directly against the axial bolt, thereby maintaining adaptability while reducing wear on the mounting components.
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
This configuration enhances the durability of the mounting part, reduces the frequency of consumable component replacement, prevents blade fixation by twined grass, and minimizes deformation and damage, ensuring consistent cutting performance.
Implementation Method 1
the inner edges of the mounting holes of the cutting blade pieces come into slide contact with the outer peripheral surfaces of the axial bolts and the nuts. In this case, since the cutting blade pieces are thin, contact pressure of slide contact parts increases. The axial bolts and the nuts or the mounting hole inner edges of the cutting blade pieces are worn.
Implementation Method 2
a plurality of thin plate-like cutting blade pieces are axially supported around the outer peripheral part of a rotary-driven bladed disk in a state having allowance and the cutting blade pieces are caused to radially project from the outer peripheral part of the bladed disk by using a centrifugal force generated when the bladed disk is rotated
Data Source
AI summary
A lawn mower in which an operating part that performs lawn mowing is equipped in a traveling machine body that travels in a field. The operating part comprises a rotary-driven bladed disk in a state of facing the field, and a cutting blade piece rockably mounted on an outer peripheral part of the bladed disk. A mounting part in which the cutting blade piece is mounted on the bladed disk comprises an axial member mounted to cross a field opposed surface of the bladed disk, and a cylindrical member which is hollow and into which the axial member is inserted with a space therebetween. The axial member is mounted on the bladed disk in a state in which the cutting blade piece is fixed to an outer periphery of the cylindrical member and the axial member is inserted into the cylindrical member.