Valve Shaft Adapter Press-Fit Coupling to Reduce Interface Wear
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Solution Overview
Problem
Conventional actuator shafts in internal combustion engines have a limited surface area interface with valve shafts, leading to high contact pressure and wear, which prevents the valve plate from adequately opening and closing, impacting engine performance.
Innovation Solution
A valve system with an adapter that includes a body corresponding to the valve shaft's recess and an aperture matching the actuator shaft's shape for a press fit, providing additional contact surfaces and preventing movement between the actuator and valve shafts, thus reducing wear and ensuring proper valve operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a direct interface between actuator shaft and valve shaft is used, then device complexity is reduced, but the contact surface area is limited leading to high contact pressure and wear
Solution Approach 1:
An adapter is introduced as an intermediary component between the actuator shaft and valve shaft. The adapter includes a first interface that couples to the valve shaft and a second interface that couples to the actuator shaft, thereby mediating the torque transmission and eliminating direct contact between the shafts. This increases the contact surface area and reduces contact pressure and wear.
Solution Approach 2:
The adapter extends the torque transmission interface in the axial dimension by introducing a separate coupling component. Instead of a single-point or small-area direct interface, the adapter provides distributed contact surfaces along its length, effectively increasing the contact surface area and reducing stress concentration.
2Adaptability or versatility
If a loose connection adapter is used, then adaptability between different shaft configurations is improved, but movement between components occurs causing wear
Solution Approach 1:
The adapter employs splined interfaces that allow for dynamic torque transmission while maintaining precise alignment. The splines engage positively to prevent relative movement between the adapter and shafts during rotation, ensuring stable connection while accommodating different shaft configurations through the modular adapter design.
Solution Approach 2:
The adapter uses asymmetric splined profiles that provide precise geometric matching between the adapter and the shafts. The splined interfaces have specific tooth shapes and spacing that prevent relative movement and ensure positive engagement, thereby eliminating play while maintaining adaptability to different shaft types.
Data Source
AI summary
A valve system may include a valve having a housing with a bore and a valve member positioned within the bore. The valve member may include a valve shaft with a recess. The valve system may also include an actuator having an actuator shaft with an end portion. An adapter may couple the valve shaft and the actuator shaft. The adapter may include a body having a shape corresponding to a shape of the recess of the valve shaft for fitting the adapter within the recess and an aperture extending into the body. The aperture may have a shape corresponding to a shape of the end portion of the actuator shaft for press fitting the adapter onto the actuator shaft. The adapter may fit within the recess and press fit coupled to the actuator shaft.