Valve Train Intermediate Lever Roller Arrangement
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Solution Overview
Problem
Mechanically controllable valve trains in motor vehicles require significant installation space without compromising rigidity, as existing designs often have overlapping components that hinder the camshaft's rotational movement.
Innovation Solution
The arrangement of roller elements in transverse planes with a symmetrical configuration and a shaft connection between the second and third roller elements allows the camshaft to engage directly with the intermediate lever, reducing the distance between the camshaft and the intermediate lever, thus minimizing installation space while maintaining rigidity through non-overlapping peripheral surfaces and a reduced number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the roller elements are arranged in a conventional configuration, then the intermediate lever has sufficient rigidity, but the installation space of the valve train is large
Solution Approach 1:
The roller elements are arranged in different transverse planes (axially offset) rather than in the same plane, allowing the cam to pass through the intermediate lever during rotation. This spatial reconfiguration reduces the axial distance between the camshaft and intermediate lever, minimizing installation space while maintaining structural rigidity through the symmetrical arrangement of rollers in the transverse direction.
Solution Approach 2:
The cam of the camshaft is able to pass through the intermediate lever during its rotational movement, effectively nesting the cam's path through the structure of the intermediate lever. This allows the camshaft to be positioned closer to the intermediate lever without interference from the roller elements, reducing the overall installation space while maintaining functional integrity.
2Volume of moving object
If the distance between the camshaft and intermediate lever is reduced, then the installation space is minimized, but the camshaft's rotational movement may be impeded by other components
Solution Approach 1:
By arranging the roller elements in different transverse planes, the cam gains a clear path through the intermediate lever structure. The rollers are positioned such that they do not obstruct the cam's rotational movement, allowing the camshaft to be placed closer to the intermediate lever without interference.
Solution Approach 2:
The intermediate lever is designed with a structure that segments the space around the cam path, allowing the cam to pass through. The roller elements are positioned in specific transverse planes that create clear zones for cam rotation, separating the support function of the rollers from the rotational path of the cam.
Data Source
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AI summary
Mechanically controllable valve train with an intermediate lever (6) with a first roller element (10) which rotates about a first axis of rotation (11) and interacts with a circumferential contour of a camshaft (14), with two valve bodies (16, 18), in particular a second roller element (16) and a third roller element (18) which rotate about a common second axis of rotation (17) which is offset parallel to the first axis of rotation, wherein the second and third roller elements (16, 18) each interact with a cam (20) and with a circumferential contour of a control shaft (19), and with a working cam contour (22) via which the intermediate lever (6) acts on a rocker arm (8) of a gas exchange valve (4), wherein the first roller element (10) is arranged axially between the second roller element (16) and the third roller element (18).