Hydraulic Excavator Reducing Agent Pump Mounting
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Solution Overview
Problem
The existing design of hydraulic excavators makes it difficult to access and maintain the reducing agent pump due to its deep placement within the vehicle body, with the fuel tank acting as an obstacle, complicating maintenance procedures.
Innovation Solution
The reducing agent pump is attached to a first column member that supports an outer cover, positioned close to the outside of the vehicle body, allowing easier access and maintenance, while the fuel filter and reducing agent tank are arranged to line up in the vehicle front and back direction to minimize obstruction during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reducing agent pump is arranged between the left and right vertical plates in the revolving frame, then the pump is positioned deep into the vehicle body, but this makes accessing the pump difficult and complicates maintenance work
Solution Approach 1:
The reducing agent pump is extracted from the revolving frame and relocated to the moving body, specifically attached to the outer side of the fuel tank. This separation removes the pump from its previously inaccessible position deep within the vehicle body, enabling easy access for maintenance while preserving the functional integration of the exhaust processing system.
2Stability of the object's composition
If the fuel tank is arranged on the outer side of the reducing agent pump, then the fuel tank structure is maintained, but the fuel tank becomes an obstacle when accessing the reducing agent pump for maintenance
Solution Approach 1:
Instead of positioning the pump inside the vehicle body with the fuel tank on its outer side (which creates an obstacle), the arrangement is inverted: the fuel tank is positioned on the outer side and the reducing agent pump is attached to the outer side of the fuel tank. This inversion eliminates the obstacle problem while maintaining structural stability.
3Volume of stationary object
If the reducing agent pump is positioned deep into the vehicle body, then space utilization is optimized, but maintenance work becomes complicated and time-consuming
Solution Approach 1:
The reducing agent pump is extracted from the deep interior position and relocated to the outer side of the fuel tank. This extraction sacrifices some internal space utilization but dramatically reduces maintenance time by making the pump easily accessible without requiring disassembly of surrounding components.
Data Source
AI summary
A hydraulic excavator includes an engine, a selective catalytic reduction apparatus, an outer cover, a first column member, a reducing agent tank, and a reducing agent pump. The selective catalytic reduction apparatus processes exhaust from the engine. The first column member supports the outer cover. The reducing agent tank retains a reducing agent. The reducing agent pump supplies the reducing agent from the reducing agent tank to the selective catalytic reduction apparatus. The reducing agent pump is attached to the first column member.