Valve Train Roller Bearing Integration
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Solution Overview
Problem
Existing mechanically controllable valve trains face increased assembly and manufacturing costs due to multiple link rollers and wear issues from slipping movements between control and guide roller surfaces, which also lead to space inefficiencies and reduced service life.
Innovation Solution
A mechanically controllable valve train design where a first bearing element arrangement is assigned to the first and second rollers, and a second bearing element is assigned to the third roller, allowing for a compact configuration with reduced assembly steps and components, utilizing roller bearings to minimize friction and weight, and optionally using a slide bearing for the second bearing element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate bearing elements are used for each roller, then each roller is properly supported, but the number of components increases and assembly complexity increases
Solution Approach 1:
The patent combines multiple bearing elements into a single integrated bearing arrangement. Specifically, the first bearing arrangement supports both the first and second rollers simultaneously, reducing the total number of bearing components while maintaining proper support for each roller element in the valve train mechanism.
2Area of stationary object
If rollers are arranged compactly on the intermediate lever, then space is saved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs a nested arrangement where the first and second rollers are positioned within the space defined by the intermediate lever's structure. The rollers are arranged between the two webs of the intermediate lever and at its axial outer ends, utilizing the existing structural geometry to achieve compact positioning without requiring additional precision beyond standard manufacturing capabilities.
3Ease of manufacture
If a single shaft connects all rollers, then assembly is simplified, but force transmission efficiency decreases due to increased deflection
Solution Approach 1:
The patent segments the roller support structure by providing separate bearing arrangements for different roller groups. The first bearing arrangement supports the first and second rollers, while the second bearing arrangement supports the third roller. This segmentation allows each bearing arrangement to be optimized for its specific load requirements, improving force transmission efficiency while maintaining reasonable assembly simplicity.
4Ease of operation
If roller surfaces slip against each other, then motion transmission occurs, but wear increases significantly reducing service life
Solution Approach 1:
The patent utilizes roller elements with curved surfaces that roll against cam surfaces rather than sliding. The camshaft roller, timing roller, and cam follower rollers are designed with cylindrical geometry that enables rolling motion, significantly reducing friction and wear compared to sliding contact, thereby extending the service life of the valve train components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the number of components, saves installation space, lowers manufacturing costs, and enhances the force introduction and service life by allowing rollers to be arranged compactly between and at the ends of the intermediate lever's webs, while minimizing friction losses and weight.
Implementation Method 1
both bearing elements are designed as rolling bearings. This reduces friction losses and increases service life
Implementation Method 2
The second bearing element can be designed as a sliding bearing
Data Source
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AI summary
The invention relates to a mechanically controllable valve train with an intermediate lever (2) having at least one camshaft roller (4) which interacts with a camshaft (14), at least one first roller (6) and one second roller (8) which are connected to each other via a shaft (12), at least one third roller (10) which is arranged between the first roller (6) and the second roller (8), wherein at least one roller (6, 8, 10) is in contact with a control shaft (18) and at least one roller (6, 8, 10) is in contact with a cam (16), and at least one working cam contour (20) which is formed at the end of the intermediate lever (2) opposite the camshaft roller (4) and which acts on a roller rocker arm (22) of a gas exchange valve (24), wherein a first bearing arrangement (25) is assigned to the first roller (6) and the second roller (8) and a second bearing arrangement (28) is assigned to the third roller (10).