Tractor Exhaust Cleaning Layout for Low Bonnet Height
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Solution Overview
Problem
Conventional tractors with multiple exhaust-gas cleaning devices require a higher mounting height for the engine bonnet due to the larger device, leading to an increased front-back length of the engine compartment.
Innovation Solution
The tractor design includes a support member with a support column and arm that positions the smaller exhaust-gas cleaning device above the engine and the larger one behind, with long sides parallel to the vehicle-body lateral width direction, allowing for a lower bonnet mounting height and shorter compartment length, while using position adjustment tools to correct manufacturing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple exhaust-gas cleaning devices are installed in the engine compartment with the conventional support structure, then both devices can be mounted, but the mounting height of the engine bonnet must be increased to accommodate the larger device
Solution Approach 1:
The support member utilizes three-dimensional space by positioning exhaust-gas cleaning devices at different vertical levels and horizontal locations. The support column extends upward from the vehicle body frame to support the first device above the engine, while the support arm extends forward to support the second device behind the engine, effectively using spatial distribution to accommodate multiple devices without increasing overall bonnet height
Solution Approach 2:
The support structure is divided into separate functional components: a support column for vertical support and a support arm for horizontal positioning. This segmentation allows each component to be optimized for its specific function, enabling flexible arrangement of exhaust-gas cleaning devices without requiring a uniformly high bonnet structure throughout
2Ease of manufacture
If exhaust-gas cleaning devices are positioned with long sides parallel to the vehicle-body longitudinal direction, then installation is simplified, but the front-back length of the engine compartment increases
Solution Approach 1:
The exhaust-gas cleaning devices are rotated 90 degrees relative to the conventional arrangement, with their long sides now parallel to the vehicle-body lateral width direction instead of the longitudinal direction. This reorientation in another dimensional arrangement allows the devices to fit within the engine compartment's width rather than extending its length, while the support member's multi-axis configuration (vertical column + horizontal arm) accommodates this new orientation
3Length of stationary object
If the mounting height of the engine bonnet is reduced, then the engine compartment becomes more compact, but it becomes difficult to support multiple exhaust-gas cleaning devices in an appropriate connection state
Solution Approach 1:
The support member is designed with adjustable and flexible characteristics, allowing it to adapt to manufacturing tolerances and connection requirements. The support column and arm can be positioned to provide appropriate support points for the exhaust-gas cleaning devices, maintaining proper connection states even with reduced bonnet height. This dynamic adaptability ensures reliable device mounting without requiring excessive clearance
Solution Approach 2:
The support member acts as an intermediary structure between the vehicle body frame and the exhaust-gas cleaning devices. It provides a stable mounting platform that distributes the devices' weight and connection forces across multiple attachment points on the frame, enabling secure installation of multiple devices within a compact engine compartment volume
Data Source
AI summary
A tractor includes: a vehicle body; an engine bonnet forming an engine compartment; an engine; a first exhaust-gas cleaning device that purifies an exhaust gas and is above the engine such that its long side is substantially parallel to a vehicle-body lateral width direction; a second exhaust-gas cleaning device that purifies the exhaust gas and is behind the engine such that its long side is substantially parallel to the lateral width direction; a vehicle body frame; and a supporting tool that is supported by the vehicle body frame, supports the first and second exhaust-gas cleaning devices, and includes a support column that extends upward from the vehicle body frame along a front portion of the second exhaust-gas cleaning device, and a support arm that extends forward from an upper portion of the support column along a lower portion of the first exhaust-gas cleaning device.