Flexible Pipe Unit for Vibration Absorption in Work Vehicle Exhaust Systems
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Solution Overview
Problem
The existing configurations for mounting exhaust gas post-processing devices on work vehicles, such as diesel particulate filtering devices and nitrogen oxide reduction catalysts, result in inadequate vibration absorption and installation error correction due to insufficient flexible pipe length and separate support systems, leading to increased engine vibration and instability.
Innovation Solution
A work vehicle design featuring a pipe unit with a linear extending part and a flexible pipe section that extends from the engine past the diesel particulate filtering device, coupled with a downstream pipe that includes a bend and an elbow, allowing for a longer flexible pipe length to absorb vibration differences and installation errors, while also using spherical joints and fixing members to secure the pipe unit and absorb angle errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diesel particulate filtering device and nitrogen oxide reduction catalyst device are mounted on the engine, then the exhaust gas post-processing function is achieved, but the combined weight becomes very large and the center of gravity becomes higher, causing increased engine vibration
Solution Approach 1:
The exhaust gas post-processing devices (diesel particulate filtering device and nitrogen oxide reduction catalyst device) are extracted from the engine and mounted on a separate table structure. This separation removes the heavy components from the engine assembly, thereby reducing engine vibration while maintaining the exhaust gas treatment function.
2Ease of manufacture
If the flexible pipe is shortened to reduce costs and space occupation, then the exhaust gas inlet can face the exhaust part directly, but the difference in vibrations between engine and exhaust gas post-processing device cannot be sufficiently absorbed
Solution Approach 1:
A flexible pipe is used to connect the exhaust part of the engine to the exhaust gas inlet of the diesel particulate filtering device. The flexibility of the pipe allows it to absorb vibration differences between the engine and the exhaust gas post-processing device mounted on the separate table, while still maintaining a relatively compact configuration.
3Ease of manufacture
If the exhaust gas inlet of the diesel particulate filtering device is disposed to face the exhaust part of the engine to shorten distance, then costs and space are reduced, but installation error cannot be sufficiently absorbed
Solution Approach 1:
The flexible pipe connection between the engine exhaust part and the diesel particulate filtering device allows for accommodation of installation errors. The flexibility provides tolerance in positioning while maintaining the shortened distance configuration that reduces costs and space occupation.
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 effectively absorbs the difference in vibrations between the engine and the exhaust gas post-processing device, as well as installation errors, reducing engine vibration and improving stability by allowing for a longer flexible pipe length and broader error absorption, thereby enhancing the overall operational stability of the work vehicle.
Implementation Method 1
a flexible pipe part provided in the linear extending part... effectively absorbs the difference in vibrations between the engine and the exhaust gas post-processing device
Implementation Method 2
a flexible pipe part... allowing for a longer flexible pipe length to absorb vibration differences
Data Source
AI summary
A difference in vibrations from an engine and from a diesel particulate filtering device and an installation error between the engine and the diesel particulate filtering device can be sufficiently absorbed in a work vehicle in which the diesel particulate filtering device is mounted on a supporting mechanism provided separately from the engine. The work vehicle is equipped with a supporting mechanism (17) fixed to a vehicle frame (2), a diesel particulate filtering device (45), and a pipe unit (23). The diesel particulate filtering device (45) is mounted on the supporting mechanism (17) above the engine (15) and has a exhaust gas inlet (45a) facing the rear. The pipe unit (23) has an extending part (54a) having one end is coupled to an end of a turbo charger (22) and extending below the diesel particulate filtering device (45) from the one end to the rear of the diesel particulate filtering device (45), and flexible pipe parts (54c, 54d), one end of which is connected to the exhaust gas inlet (45a) of the diesel particulate filtering device (45) from the rear.