Forklift Tail Pipe Layout for Even Exhaust Cooling and Low Noise
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Solution Overview
Problem
Industrial vehicles like forklifts face challenges in reliably and evenly reducing exhaust gas temperature, especially when operating both outdoors and indoors, due to the introduction of outside air into the tail pipe, which affects exhaust temperature consistency.
Innovation Solution
The design includes a counterweight with a radiator and fan, an exhaust pipe with a tail pipe extending in the vehicle width direction, featuring first and second exhaust ports on the circumferential surface of the tail pipe where cooling air flows, and a throttling part between these ports to manage flow path area, ensuring even pressure and discharge of exhaust gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If outside air is introduced into the tail pipe through the Venturi effect, then exhaust gas temperature is reduced, but exhaust temperature cannot be reduced reliably and evenly when operating both outdoors and indoors
Solution Approach 1:
The tail pipe is divided into multiple discharge ports (first discharge port and second discharge port) positioned at different locations. This segmentation allows exhaust gas to be discharged through multiple pathways, ensuring that temperature reduction is achieved reliably whether the vehicle operates outdoors or indoors, as at least one discharge port will effectively utilize available cooling air.
Solution Approach 2:
The discharge ports are positioned at different vertical heights within the tail pipe. The first discharge port is positioned higher and the second discharge port is positioned lower, creating a vertical dimension for exhaust discharge. This dimensional arrangement ensures that cooling air can effectively contact exhaust gas regardless of the vehicle's operating environment.
2Temperature
If exhaust gas is discharged only from the second exhaust port, then exhaust temperature can be reduced, but discharge flow velocity is high causing increased exhaust noise
Solution Approach 1:
The exhaust discharge function is segmented into two separate discharge ports instead of using a single port. This segmentation distributes the exhaust flow across two openings, reducing the flow velocity at each port and thereby suppressing exhaust noise while still achieving effective temperature reduction through contact with cooling air.
Solution Approach 2:
Instead of using only the second discharge port (which would provide sufficient temperature reduction), both the first and second discharge ports are utilized. This partial use of additional discharge pathways reduces exhaust flow velocity at each port, effectively suppressing noise without compromising temperature reduction performance.
3Reliability
If a throttling part is disposed between the first exhaust port and the second exhaust port, then pressure in the tail pipe becomes even and exhaust gas discharges evenly, but device complexity increases
Solution Approach 1:
A throttling part is positioned specifically between the first and second discharge ports within the tail pipe. This local throttling structure creates a pressure balancing effect that ensures even exhaust gas discharge through both ports. The throttling part is strategically placed only where needed to equalize pressure, rather than complicating the entire exhaust system.
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 reduces exhaust gas temperature consistently and suppresses noise by ensuring even discharge and agitation with cooling air, while the throttling part maintains even pressure and flow rates, enhancing exhaust gas discharge efficiency.
Implementation Method 1
a radiator fan configured to generate cooling air flowing behind the vehicle body
Implementation Method 2
When the exhaust gas is exhausted from the exhaust pipe to the tail pipe, outside air is introduced into the tail pipe due to a Venturi effect
Data Source
AI summary
A forklift includes a downstream exhaust pipe that releases engine exhaust gas into the atmosphere. The downstream exhaust pipe includes a tail pipe extending in a width direction of a vehicle body. A closure part that closes a tail pipe's opening is provided at the tail pipe's tip end portion. A first exhaust port which discharges the exhaust gas rearward from the vehicle body and a second exhaust port which discharges the exhaust gas rearward from the vehicle body at the tail pipe's tip end side with respect to the first exhaust port are provided in the tail pipe's circumferential surface portion. The first exhaust port and the second exhaust port are disposed in a region where cooling air flows. A throttling part that changes a flow path area for the exhaust gas is disposed between the first exhaust port and the second exhaust port in the tail pipe.