Rotary Cutting Unit Deflection Baffle Design

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Solution Overview

Problem

Conventional deflection baffles in rotary cutting units for golf course mowing machines reduce the lift effect of cutting blades, cause stress on the blade and spindle, and lead to clippings accumulation, resulting in poor cut quality and increased maintenance needs.

Innovation Solution

A rotary cutting unit with a deflection baffle featuring a sloped bottom plate upwardly and a front plate inwardly sloped toward the spindle, extending between 45 degrees and 90 degrees, which directs clippings inwardly without restricting performance or causing stress, maintaining blade lift and preventing loosening or vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional deflection baffles are used to move clippings downwardly, then clipping flow is improved, but blade lift effect is reduced and grass quality deteriorates

Engineering Contradiction:

Improveclipping flowVSAvoidblade lift effect

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

Instead of using conventional deflection baffles that push clippings outwardly above the blade's cutting edge (reducing lift effect), this invention uses a downwardly sloped bottom plate that directs clippings downwardly through the plane of the blade. This inverted approach maintains blade lift effect while improving clipping flow and discharge.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If conventional deflection baffles are used to direct clippings outwardly, then clipping discharge is improved, but stress on blade tip increases causing loosening and vibration

Engineering Contradiction:

Improveclipping dischargeVSAvoidblade tip stress

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

This invention extracts the harmful outward-pushing function from the deflection baffle design. By removing the conventional upward-sloped baffle that creates high stress pressure points on the blade tip, and replacing it with a downwardly sloped bottom plate, the design eliminates excessive stress while maintaining effective clipping discharge through the rear outlet.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If conventional deflection baffles are used to force clippings down, then mulching capability is improved, but clippings accumulate under the cutting unit

Engineering Contradiction:

Improvemulching capabilityVSAvoidclippings accumulation

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

This invention creates a dynamic clipping flow system where the downwardly sloped bottom plate continuously directs clippings toward the rear discharge outlet, preventing accumulation. The design allows the cutting unit to dynamically adapt between mulching mode (with mulch plate installed) and discharge mode (with mulch plate removed), maintaining efficient clipping movement in both configurations.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8127522B2Rotary cutting unit with deflection baffle

Publication Date: 2012.03.06 DEERE & CO

AI summary

A rotary cutting unit with a deflection baffle in the cutting chamber, the deflection baffle including a bottom plate attached to the wall at the rear of the cutting chamber and increasing in width in the direction of blade rotation, and a front plate joined to the bottom curved plate and extending from the wall at the rear of the cutting chamber and sloping radially inwardly toward the center spindle in the direction of blade rotation.