Valve Flap Hub Element Torque Transmission
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Solution Overview
Problem
Existing valve flap connections in internal combustion engines face challenges such as loss of screw tension at high temperatures, limited accessibility for riveting, and stringent tightness requirements, particularly in double-flow valves where manufacturing tolerances impact tightness.
Innovation Solution
A valve flap arrangement featuring a hub element between the shaft and valve flap to transmit torque, allowing for simplified assembly and high tightness, using a shaft-hub connection that can include form-fitting or frictional connections, and optionally energy storage elements to compensate for tolerances and ensure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw connections are used to connect the flap to the shaft, then torque can be transmitted, but the screw tension is lost at very high temperatures
Solution Approach 1:
A hub element is introduced as an intermediary component between the shaft and the valve flap. The hub element receives torque from the shaft via a shaft-hub connection and transmits it to the valve flap, eliminating the need for direct screw connections between the shaft and flap that fail at high temperatures.
2Strength
If rivet connections are used to connect the flap to the shaft, then torque can be transmitted, but the flap is only accessible from one side making counter-holding impossible
Solution Approach 1:
The hub element serves as a mediator that can be attached to the shaft from one side only. It provides a mounting surface for the valve flap that is accessible from both sides, enabling rivet or screw connections without requiring access to both sides of the shaft.
3Reliability
If direct flap-shaft connections are used, then torque is transmitted directly, but very high assembly accuracy is required to meet strict tightness requirements
Solution Approach 1:
The hub element acts as a mediator that decouples the tightness requirements from the direct flap-shaft interface. The shaft-hub connection and hub-flap connection can each have their own tolerance compensation mechanisms, allowing for easier assembly while maintaining overall tightness.
Solution Approach 2:
The direct flap-shaft connection is segmented into two separate connections: shaft-hub connection and hub-flap connection. This segmentation allows each interface to be optimized independently for tolerance compensation and tightness.
4Ease of manufacture
If pin connections are used to connect the flap to the shaft, then assembly can be simplified, but the connection is only suitable to a limited extent for transmission of high, shock-prone moments
Solution Approach 1:
The hub element serves as a robust intermediary that can be strongly connected to the shaft using pin connections for easy assembly. The hub element itself is designed to withstand high shock loads and transmit torques effectively to the valve flap, overcoming the limitations of direct pin connections.
Data Source
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AI summary
The invention relates to a valve flap assembly (1) of a valve device, in particular of an internal combustion engine, comprising a shaft (4), which can be rotated about a shaft axis (4a), and at least one valve flap (2, 2', 2c), which is placed on the shaft (4) and is connected to the shaft (4) for the transmission of a torque. At least one hub element (3) is provided, by means of which the at least one valve flap (2, 2', 2c) is connected to the shaft (4). A valve device, in particular of an internal combustion engine, is equipped with at least one valve flap assembly (1).