Flat Plane Pendulum Carrier Crankshaft Attachment
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Solution Overview
Problem
Existing methods for attaching pendulum carriers to crankshafts are overly complex, leading to increased production costs and potential damage to the crankshaft, while also requiring excessive machining and drilling, which complicates the process and increases costs.
Innovation Solution
The proposed solutions involve various embodiments for attaching pendulum carriers to crankshafts, including using spaced apart attachment bosses with grooves, extended bosses to avoid drilling into the thrust face, a combination of flat and cylindrical portions, a deck with lateral attachment bosses, and a machined groove with attachment arms, which simplify the attachment process and reduce the need for machining and drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical fastening methods are used to attach pendulum carriers to crankshafts, then secure attachment is achieved, but excessive machining and drilling are required
Solution Approach 1:
The attachment system is divided into separate components: the crankshaft web with integrated attachment bosses and grooves, and the pendulum carrier with corresponding engagement features. This segmentation allows each component to be manufactured independently with simpler machining operations, while the assembly provides secure attachment through the interlocking geometry of bosses, grooves, and fasteners.
Solution Approach 2:
Attachment bosses serve as intermediary elements between the crankshaft web and the pendulum carrier. These bosses extend from the web and provide dedicated attachment points that eliminate the need for excessive drilling into the crankshaft itself, thereby reducing machining complexity while maintaining secure fastening capability.
2Ease of manufacture
If attachment bosses extend closer to the crankshaft web, then manufacturing is simplified, but drilling may damage the thrust face
Solution Approach 1:
The attachment bosses are extended in the axial dimension away from the crankshaft web, creating sufficient clearance between the drilling operation and the thrust face. This dimensional adjustment allows drilling to proceed without risking damage to the thrust face, while the bosses remain sufficiently close to simplify the overall attachment geometry.
3Reliability
If excessive machining is performed on the crankshaft, then pendulum carrier attachment is achieved, but production costs increase
Solution Approach 1:
The crankshaft web is designed with pre-formed attachment bosses and grooves that are integrated into the basic crankshaft geometry. These features are created as part of the primary crankshaft manufacturing process rather than through subsequent extensive machining operations, thereby reducing production costs while ensuring stable attachment of the pendulum carrier.
Solution Approach 2:
The attachment system utilizes geometric parameters of the bosses (such as their length, diameter, and spacing) that are optimized during the initial crankshaft design and manufacturing process. By adjusting these parameters within the manufacturing tolerances of the base process, stable attachment is achieved without requiring additional costly machining operations.
4Reliability
If complex attachment methods are used, then secure pendulum carrier attachment is achieved, but production time and cost increase
Solution Approach 1:
The attachment system is segmented into distinct, pre-formed features (bosses, grooves, fastener holes) that can be manufactured independently and assembled straightforwardly. This segmentation enables parallel manufacturing processes and simplifies quality control, thereby improving production efficiency while maintaining secure attachment.
Solution Approach 2:
The attachment bosses and grooves are designed to self-align and guide the pendulum carrier into proper position during assembly. This self-guiding feature reduces the need for complex alignment procedures and specialized assembly equipment, thereby speeding up production while ensuring secure and accurate attachment.
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
These solutions provide cost-effective and simplified methods for attaching pendulum carriers, reducing manufacturing complexity and costs, while maintaining effective vibration reduction and ensuring secure attachment without compromising the crankshaft's performance.
Implementation Method 1
The pendulum carrier is fitted into the groove and is mechanically attached to the web by, for example, pressed-in pins
Implementation Method 2
The pendulum carrier is inserted into the attachment groove such that the cylindrical portion of the carrier fits within the cylindrical portion of the attachment groove
Implementation Method 3
The cylindrical portion of the pendulum carrier includes an end cap that restricts movement within the attachment groove
Implementation Method 4
The curved surfaces of the attachment bosses carry the load of the pendulum assembly
Data Source
AI summary
A pendulum absorber fixed to the crankshaft of an engine comprises a pendulum and a pendulum carrier attached to the pendulum carrier attachment boss of the crankshaft. The first preferred embodiment provides a crankshaft web having spaced apart part pendulum carrier attachment bosses that define a carrier groove. The second preferred embodiment provides an arrangement similar to that of the first embodiment but the attachment bosses extend further away from the web. The third preferred embodiment provides a pendulum carrier having a flat portion and a cylindrical portion. The fourth preferred embodiment provides a carrier engagement portion that includes a deck and two lateral attachment bosses having curved surfaces. The carrier includes two outwardly-extending attachment arms. The fifth preferred embodiment provides a web having a pendulum carrier engagement portion that includes a machined groove and machined attachment bosses. The pendulum carrier includes attachment arms that engage the machined attachment bosses.