Side Cutting Beam Rail With Profile Tube for Low-Mass Rigidity
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Solution Overview
Problem
Existing side cutting units for agricultural harvesting machines, particularly those used in combine harvesters, suffer from high mass and deformation due to large transverse dimensions and bending moments caused by cutting forces, which are exacerbated by the need for stable structures to accommodate long lever arms.
Innovation Solution
A side cutting unit design featuring a compact beam rail structure with a one-piece profile tube made of aluminum, supported by a triangular support frame and equipped with a drive device that minimizes power transmission distance and incorporates bearing elements to distribute and dampen forces, using a lightweight extruded profile tube with internal stiffening webs for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a web-like structure is used to support oscillating cutting blades, then the structure provides necessary support, but it introduces high bending moments and requires large transverse dimensions, resulting in high mass
Solution Approach 1:
The beam rail structure is segmented into a box-section structure and a separate web-like structure, allowing the cutting forces to be introduced directly into the box-section structure while the web-like structure provides support for the oscillating cutting blades, thereby reducing the overall mass and bending moments
Solution Approach 2:
The beam rail structure transitions from a two-dimensional web-like structure to a three-dimensional box-section structure with internal web-like elements, providing both structural support and cutting force resistance in a compact design that reduces mass
2Device complexity
If oscillating cutting blades are detached and attached directly to the box profile structure via retaining tabs, then the structure is simplified, but the cutting forces must be introduced via a long lever arm, requiring extreme stability and significantly increasing mass
Solution Approach 1:
A beam rail structure is introduced as an intermediary element between the box profile structure and the oscillating cutting blades, allowing cutting forces to be introduced directly into the beam rail rather than via a long lever arm, thereby reducing the mass requirements of the box profile structure
Solution Approach 2:
The side cutting unit is segmented into a box profile structure, a beam rail structure, and oscillating cutting blades, allowing each component to be optimized for its specific function and reducing the overall mass by distributing structural requirements
3Stability of the object's composition
If a box-section structure with large transverse dimensions is used, then stability is improved, but the bending moments from cutting forces increase and the mass becomes extremely high
Solution Approach 1:
The beam rail structure is segmented into a compact box-section structure with internal web-like elements, providing both structural stability and cutting force resistance in a compact design that reduces mass compared to large transverse dimensions
Solution Approach 2:
The beam rail structure combines box-section and web-like structures to create a composite design that provides both stability and cutting force resistance with reduced mass
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention relates to a side cutting unit (4) for a cutting unit (1) of an agricultural harvesting machine, comprising a support frame (30) designed as a beam rail (6), wherein the beam rail (6) supports at least one oscillating cutting knife (7) in the longitudinal direction by means of knife holding devices (8) and is coupled at one end to a drive (31) that causes the oscillation movement of the at least one cutting knife (7), and the beam rail (6) is designed as a one-piece profile tube (32), in particular an extruded profile tube (33).