Eccentric Valve Shaft Plane for Exhaust Gas Recirculation Wear Reduction
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Solution Overview
Problem
Existing control devices for internal combustion engines experience increased wear and potential leaks when closing the exhaust gas recirculation channel, leading to reduced tightness and shorter service life due to transverse forces on the valve body and seat.
Innovation Solution
The control device features a shaft axis arranged in a plane spanned by the valve seat, with a control body that exerts only axial forces when closing the exhaust gas recirculation channel, avoiding shear forces and allowing for axial movement, and the valve seat is inclined to guide condensate away from the flow area, reducing wear and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control body is actuated via an eccentrically arranged rotary shaft, then the intake channel can be opened and the exhaust gas recirculation channel can be closed, but transverse forces act on the valve body and valve seat causing increased wear and reduced service life
Solution Approach 1:
The invention changes the actuation mechanism from rotational movement to linear movement along the channel axis. The control body is moved exclusively in the axial direction of the exhaust gas recirculation channel by the actuating device, eliminating rotational components that generate transverse forces. This dimensional change in movement type prevents shear forces on the valve seat while maintaining effective channel control.
Solution Approach 2:
The invention extracts and eliminates the eccentric rotary shaft mechanism that causes transverse forces. By replacing it with a linear actuating device that moves the control body exclusively along the channel axis, the harmful transverse components are removed from the system, leaving only the beneficial axial closing action.
2Reliability
If the valve body and valve seat are subjected to transverse forces during closing, then the channels can be sealed, but wear increases and leaks develop over time
Solution Approach 1:
The sealing action is achieved through purely axial movement of the control body along the channel axis, rather than rotational or oblique movement. This unidirectional axial approach ensures that closing forces are applied perpendicular to the valve seat surface, maximizing sealing effectiveness while eliminating transverse wear components.
Solution Approach 2:
The harmful transverse forces are completely removed from the sealing mechanism. The actuating device is designed to apply only axial forces during closing, extracting the wear-causing transverse components from the system while preserving the sealing function.
3Loss of energy
If the shaft is arranged outside the flow cross section, then pressure loss in the intake duct is prevented, but the valve body and seat experience increased wear
Solution Approach 1:
The actuating mechanism is changed from rotational to linear motion, allowing the control body to be positioned optimally for minimizing pressure loss while maintaining effective sealing. The linear axial movement enables the control body to seal the exhaust gas recirculation channel without requiring an eccentric rotary shaft arrangement.
Data Source
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AI summary
Control devices for internal combustion engines are known, comprising an intake channel (12) having an inlet (14) and an outlet (20), an exhaust gas return channel (16) which feeds into the intake channel (12), a control element (46), an opening (18) of the exhaust gas return channel (16) which functions as a fixed valve seat (58) for the control element (46) in the state closing the exhaust gas return channel (16), and a shaft (42) functioning as the axis of rotation (44) of the control element (46), on which the control element (46) is eccentrically secured, wherein the control element (46) can be moved, by rotating the shaft (42), between a first end position in which the control element (46) at least throttles the intake channel (12), and a second end position in which the control element (46) is in contact with the valve seat (58) at the opening (18) of the exhaust gas return channel (16). According to the invention, in order to reduce the wear in the region of the valve seat, the axis of rotation (44) of the shaft (42) is arranged in a plane (60) passing through the valve seat (58) at the opening (18) of the exhaust gas return channel (16).