Fan Clutch Attachment Assembly With Perpendicular Tool Access
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Solution Overview
Problem
Current fan clutch assemblies in vehicular applications present difficulties in maintenance due to the accessibility of parallel-oriented attachment bolts, which are hard to access and maintain, especially in confined engine compartments.
Innovation Solution
A clutch assembly design that allows for side-access disassembly and maintenance by incorporating a journal bracket with a center shaft, a drive feature, a clutch pack, and a stub shaft with perpendicular engagement features, enabling tools to engage and disengage the removable connection from a location perpendicular to the axis of rotation, thereby simplifying the removal and replacement of the clutch pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If attachment bolts are oriented parallel to the axis of rotation of the clutch pack, then the clutch pack can be securely attached to the drive feature, but the bolts become difficult to access and increase maintenance time
Solution Approach 1:
The patent changes the orientation of engagement features from parallel to perpendicular relative to the axis of rotation. The perpendicular engagement features on the stub shaft allow tool access from the side (perpendicular direction) rather than requiring access from the front (parallel direction), thereby solving the accessibility problem while maintaining secure attachment
2Reliability
If the clutch pack is designed with parallel-oriented attachment bolts, then the connection is structurally sound, but the maintenance time increases due to difficult access in confined engine compartments
Solution Approach 1:
By orienting the engagement features perpendicular to the axis of rotation, the patent enables side-access maintenance from the engine compartment without requiring removal of obstructing components. This dimensional change in access orientation reduces maintenance time while preserving connection reliability through proper engagement geometry
3Strength
If the sheave is configured as a single piece forming part of the piston chamber boundary, then the structural integrity is maintained, but the complexity of disassembly increases due to integrated components
Solution Approach 1:
The patent divides the clutch assembly into separable components: the clutch pack with stub shaft can be independently removed from the drive feature while the sheave remains integrated with the piston chamber. This segmentation allows the clutch pack to be serviced separately without disassembling the sheave or piston chamber, reducing disassembly complexity while maintaining structural integrity of the remaining components
Data Source
AI summary
A clutch assembly includes a journal bracket having a center shaft, a drive feature rotatably supported on the center shaft of the journal bracket and configured to accept a torque input to the clutch assembly, a clutch pack that is controllable to selectively transmit torque between an input and an output, a housing attached to the clutch pack that includes a stub shaft, a removable connection engaged between the drive feature and the stub shaft such that torque is transmittable through the removable connection during operation of the clutch assembly, and one or more perpendicular engagement features on the stub shaft configured to accept a tool to engage and disengage the removable connection. At least one of the perpendicular engagement features is exposed to line-of-sight access from a location substantially perpendicular to an axis of rotation of the clutch pack.