Wheel Loader Exhaust Gas Device Mounting Vibration
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Solution Overview
Problem
The vibration of exhaust gas post-processing devices in wheel loaders is not sufficiently suppressed when mounted above the engine, and the added weight and complexity of nitrogen oxide reduction catalyst devices increase engine vibration and require longer support posts, potentially compromising strength and increasing installation space requirements.
Innovation Solution
A wheel loader design that uses a high-stiffness stand to support the operating fluid tank, which also supports the diesel particulate filtering and nitrogen oxide reduction catalyst devices, along with a flexible pipe unit and adjustable mechanism to manage installation errors and vibration differences between the engine and these devices, reducing the need for additional support members and minimizing space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nitrogen oxide reduction catalyst device is mounted on the engine in addition to the diesel particulate filtering device, then the exhaust gas post-processing function is improved, 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 separately on the vehicle frame using a mounting mechanism. This separation removes the heavy objects from the engine, preventing increased engine vibration while maintaining the exhaust gas treatment function.
2Length of stationary object
If the four posts of the mounting mechanism are made longer to allow the exhaust gas post-processing device to be disposed above the engine, then the spatial arrangement is improved, but the heavy object loaded on the long posts causes insufficient vibration suppression and potential strength deficiency
Solution Approach 1:
Vibration cushions are installed at the lower ends of the four posts where they connect to the vehicle frame. These cushions provide vibration suppression in advance, allowing the use of longer posts for proper spatial arrangement above the engine without compromising vibration control or structural strength.
3Stability of the object's composition
If the posts of the mounting mechanism are strengthened to suppress vibration, then the vibration resistance is improved, but the thickness of the posts needs to be increased, requiring a longer space for installing the exhaust gas post-processing device
Solution Approach 1:
Instead of increasing post thickness to suppress vibration, vibration cushions are installed at the connection points of the posts. This approach provides effective vibration resistance without requiring thicker posts, thereby maintaining compact installation space above the engine.
4Device complexity
If the diesel particulate filtering device and nitrogen oxide reduction catalyst device are mounted directly on the engine, then the device complexity is reduced, but the center of gravity becomes higher and engine vibration increases
Solution Approach 1:
The exhaust gas post-processing devices are extracted from direct engine mounting and relocated to a separate mounting mechanism on the vehicle frame. This extraction eliminates the harmful effect of increased engine vibration caused by mounting heavy devices on the engine, while the mounting mechanism with vibration cushions provides stable support.
Data Source
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AI summary
Vibration of a diesel particulate filtering device can be suppressed with a simple and strong mechanism in a wheel loader in which the diesel particulate filtering device is disposed above an engine. The wheel loader is equipped with an operating fluid tank (19) disposed in front of the engine (15), a front support frame (26), a rear support frame (27), a base plate (28), and a processing device such as a diesel particulate filtering device (45) mounted on the base plate (28). The front support frame (26) is fixed to a vehicle frame (2) and supports the operating fluid tank (19). The rear support frame (27) is disposed facing the front support frame (26) with the engine disposed therebetween, and is fixed to the vehicle frame (2). The base plate (28) is arranged above the engine (15), and has one end fixed to an upper part of the front support frame (26) and the other end fixed to an upper part of the rear support frame (27).