Valve Train Carrier Cylinder Deactivation Capsule
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Solution Overview
Problem
Conventional valve train carrier assemblies require modification to incorporate deactivating rocker arms, increasing complexity and cost, while existing solutions do not effectively address the need for efficient cylinder deactivation mechanisms.
Innovation Solution
A valve train carrier assembly with dedicated apertures for cylinder deactivation capsules and an oil control valve to selectively transition these capsules between latched and unlatched positions, allowing for efficient deactivation of rocker arms by controlling fluid supply to absorb or transfer motion from push rods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional valve train carrier assemblies are modified to incorporate deactivating rocker arms, then the deactivation function is achieved, but the complexity and cost increase
Solution Approach 1:
The valve train carrier assembly is segmented into modular components: the carrier body with integrated apertures, separate CDA capsules, and distinct fluid control devices. This segmentation allows the deactivation function to be added as discrete, standardized modules rather than requiring complex modifications to the entire carrier assembly, thereby achieving versatility while controlling complexity
Solution Approach 2:
The fluid control device serves multiple functions: it controls the CDA capsules for deactivation, and the same device can potentially control other valve train components. The carrier assembly design with standardized apertures allows the same structure to accommodate different rocker arm configurations (active or deactivated), providing universal applicability across different engine modes
2Adaptability or versatility
If conventional valve train carrier assemblies are modified to incorporate deactivating rocker arms, then the deactivation function is achieved, but the cost increases
Solution Approach 1:
By segmenting the deactivation system into separate CDA capsules that can be manufactured independently and installed in standardized apertures, the production process becomes more efficient. Each component can be manufactured using optimized processes for that specific part, reducing overall manufacturing cost compared to custom-modified integrated assemblies
Solution Approach 2:
The CDA capsules are designed to be self-contained units with integrated sealing and actuation mechanisms. This self-service design reduces assembly complexity and manufacturing cost, as the capsules can be pre-assembled and tested independently before installation in the carrier assembly, eliminating the need for complex field modifications
3Loss of energy
If rocker arms are deactivated, then fuel efficiency is improved, but the mechanism complexity increases
Solution Approach 1:
The deactivation mechanism uses hydraulic actuators (CDA capsules) controlled by fluid pressure from a centralized fluid control device. This hydraulic approach provides smooth, controlled deactivation with minimal mechanical complexity, as the fluid pressure naturally provides the force needed to engage and disengage the deactivation mechanism without requiring complex mechanical linkages or high-force actuators
Solution Approach 2:
The CDA capsule acts as an intermediary element between the push rod and rocker arm. When deactivated, the capsule absorbs the motion from the push rod through its compliant elements, preventing direct transmission to the rocker arm. This intermediary mechanism provides a simple yet effective way to achieve deactivation without requiring complex disengagement mechanisms or multiple moving parts
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
The solution enables cost-effective and simplified integration of deactivating rocker arms, improving engine efficiency and reducing complexity by allowing selective activation and deactivation of rocker arms, enhancing fuel efficiency and thermal management.
Implementation Method 1
the fluid control device can selectively supply a pressurized fluid to the first and second CDA capsules to transition them between a latched position and an unlatched position
Data Source
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AI summary
A valve train assembly includes an intake rocker arm, an exhaust rocker arm, a carrier configured to couple to a cylinder block and operably associated with the intake rocker arm and the exhaust rocker arm, the carrier including a first aperture, and a cylinder deactivation (CDA) capsule disposed within the first aperture. The CDA capsule is configured to move between a latched condition that transfers motion from a push rod to one of the intake rocker arm and the exhaust rocker arm, and an unlatched condition that absorbs motion from the push rod and does not transfer the motion to the intake rocker arm or the exhaust rocker arm.