Supercharged Engine Intake Joint Restrictor Design
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Solution Overview
Problem
In vehicles equipped with superchargers, the increased air intake pressure can cause the throttle body's upstream components to detach from the engine, which is not effectively addressed by existing mounting structures.
Innovation Solution
A vehicle design that includes a first joint connecting the intake manifold and throttle body, with a restrictor that restricts relative movement between the engine head and the first joint, using an elastic member and a C-shaped groove and engaging member to securely attach the throttle body, allowing the use of conventional throttle bodies from naturally aspirated engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rubber throttle holder is used to fix the throttle body to the cylinder head, then the assembly is simple and easy to manufacture, but the throttle body may detach under high air intake pressure in supercharged engines
Solution Approach 1:
The air intake system is divided into multiple connection points: the first joint connects the intake manifold to the throttle body, while the second joint connects the throttle body to the cylinder head. This segmentation allows each joint to be optimized for its specific function - the first joint handles high pressure from the supercharger, while the second joint provides stable mounting.
Solution Approach 2:
The first joint acts as an intermediary component between the intake manifold and the throttle body. It includes an elastic member that mediates the connection, absorbing pressure fluctuations and preventing direct transmission of high air intake pressure to the throttle body mounting points, thereby preventing detachment.
2Device complexity
If the throttle body is fixed directly to the cylinder head, then the structure is simple, but members on the upstream side of the throttle body may detach under high pressure
Solution Approach 1:
The air intake system is divided into multiple connection points: the first joint connects the intake manifold to the throttle body, while the second joint connects the throttle body to the cylinder head. This segmentation allows each joint to be optimized for its specific function - the first joint handles high pressure from the supercharger, while the second joint provides stable mounting.
Solution Approach 2:
The first joint acts as an intermediary component between the intake manifold and the throttle body. It includes an elastic member that mediates the connection, absorbing pressure fluctuations and preventing direct transmission of high air intake pressure to the throttle body mounting points, thereby preventing detachment.
3Reliability
If a special structure throttle body is used for supercharged engines, then the detachment problem is solved, but the adaptability and versatility of the throttle body design is reduced
Solution Approach 1:
The first joint is designed with an elastic member that can accommodate both supercharged and naturally aspirated engine configurations. This universal design allows the same throttle body assembly to be used across different engine types, with the elastic member adapting to pressure variations without requiring special structural modifications to the throttle body itself.
Solution Approach 2:
The elastic member in the first joint changes its physical parameters (flexibility, compression) in response to pressure conditions. Under high supercharging pressure, the elastic member compresses to absorb the force, while under normal pressure it maintains a secure connection. This parameter change allows a single component to handle multiple operating conditions.
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
Prevents the detachment of upstream components from the throttle body even under high air intake pressure, enabling the use of standard throttle bodies in supercharged engines, such as in snowmobiles, by securely attaching the throttle body and maintaining a consistent positional relationship.
Implementation Method 1
the first joint includes an elastic member. In this case, even if the first joint is subjected to an external force, it is possible to absorb the external force and to prevent the first joint from detaching more reliably
Data Source
AI summary
A snowmobile includes an engine including an engine head including a cylinder head, a supercharger, an intake manifold, throttle bodies, first joints that connect the intake manifold to the throttle bodies, second joints that connect the throttle bodies to the cylinder head, and a restrictor that connects the engine head to the first joints. The restrictor includes an engaging member that fits into grooves of the first joints, and connectors that connect the engaging member and the engine head to each other. A steering shaft is inserted between two mutually adjacent first joints which have a distance from each other greater than a distance between the other two mutually adjacent first joints.