Mechanical Coupling Device for Variable Valve Lift Control
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Solution Overview
Problem
Existing valve-actuating systems for reciprocating internal combustion engines with variable valve lift require complex hydraulic or electronic systems to change valve lift, which can be cumbersome and inefficient.
Innovation Solution
A coupling apparatus with a blocking device and coupling elements that allow for mechanical actuation of valve lift by blocking or unblocking the transmission of valve-actuating motions, enabling simple mechanical adjustment of valve lift without the need for hydraulic or electronic devices, using a rotational motion generated by a cam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydraulic or electronic systems are used to change valve lift, then variable valve lift can be achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex hydraulic or electronic valve lift control systems with a purely mechanical coupling apparatus. The coupling elements and blocking device mechanically transmit or block cam-generated valve-actuating motions to achieve variable valve lift without requiring hydraulic fluid systems or electronic control components, thereby reducing overall system complexity while maintaining adaptability.
Solution Approach 2:
The valve actuation system is segmented into distinct functional components: a cam mechanism that generates valve-actuating motions, coupling elements that transmit these motions, and a blocking device that selectively interrupts transmission. This segmentation allows independent optimization of each component and simplifies the overall system architecture compared to integrated hydraulic or electronic systems.
2Manufacturing precision
If hydraulic or electronic systems are used for valve lift control, then precise valve lift adjustment is possible, but friction and wear increase
Solution Approach 1:
The patent eliminates hydraulic fluid friction and electronic component wear by using a mechanical coupling system with low-friction interfaces. The coupling elements and blocking device use simple mechanical contacts and geometric constraints to achieve precise valve lift control without the continuous friction associated with hydraulic seals or the wear from electronic actuator components.
Solution Approach 2:
The mechanical coupling apparatus is designed to be self-regulating through geometric constraints and mechanical interference. The blocking device automatically engages or disengages based on cam position and spring forces, eliminating the need for additional control systems that would introduce friction and wear while maintaining precise valve lift positioning.
3Device complexity
If mechanical actuation with blocking device is used, then device complexity is reduced, but control precision may be compromised
Solution Approach 1:
The cam mechanism is designed with pre-calculated geometry that determines the exact valve lift profile. The coupling elements and blocking device are positioned at specific locations on the cam to achieve precise valve lift control at predetermined cam angles. This preliminary geometric design ensures that the simple mechanical system achieves the same precision as complex hydraulic or electronic systems without requiring active control.
Solution Approach 2:
The patent uses purely mechanical geometric constraints and kinematic relationships to achieve precise valve lift control. The coupling apparatus translates cam rotation into precise linear valve motion through carefully designed mechanical linkages and blocking positions, eliminating the need for sensors, actuators, or control algorithms while maintaining manufacturing precision.
Data Source
AI summary
The present invention relates to a coupling device for a valve-actuating device for actuating at least one valve of a reciprocating machine having variable valve lift, in particular for a valve-actuating device of a reciprocating internal combustion engine, to a valve-actuating device and to a reciprocating machine, the coupling device comprising a first coupling element, a second coupling element and a blocking means. The first coupling element and the second coupling element can be displaced relative to one another at least within defined boundaries along a first axis, it being possible for the blocking means to block the relative displacement of the two coupling elements with respect to one another along the first axis at least in a first direction. The blocking means comprises a blocking element, which can be rotated about the first axis in the circumferential direction at least in a defined region, the relative displacement of the two coupling elements along the first axis being blocked at least in the first direction if the blocking element is in a blocking position.