Reverse-Input Blocking Clutch Assembly With Leaf Spring Alignment
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Solution Overview
Problem
The assembly of reverse-input blocking clutches with elastic members is inefficient due to the difficulty in inserting output-side engaging portions between leaf springs, which increases assembly cost and complexity, and the lack of support for leaf springs, leading to potential misalignment and increased force requirements during operation.
Innovation Solution
Incorporating a displacement prevention means, such as a stopper member or spacers, to prevent axial displacement of engaging elements and using elastic members like leaf springs between engaging elements and output-side engaging portions, facilitating assembly by allowing relative movement in the radial direction and maintaining proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic members (leaf springs) are used to suppress looseness of the output member, then reliability is improved, but assembly efficiency deteriorates due to difficulty in inserting output-side engaging portions between the leaf springs
Solution Approach 1:
The invention divides the assembly process into two independent stages: first assembling the engaging elements with leaf springs and housing elements, then separately assembling the output member with output-side engaging portions, and finally combining these pre-assembled units. This segmentation eliminates the difficult insertion operation while maintaining the looseness suppression function of the leaf springs.
Solution Approach 2:
The invention performs preliminary assembly of the engaging elements with the leaf springs and housing elements before final assembly with the output member. By pre-positioning the leaf springs and engaging elements in the housing elements, the difficult insertion operation is avoided, and the final assembly becomes a simple combination of pre-assembled units.
2Device complexity
If elastic members are elastically held between output-side engaging portions and engaging elements without additional support, then device complexity is reduced, but manufacturing precision deteriorates due to potential displacement and misalignment
Solution Approach 1:
The invention introduces housing elements as intermediary components that provide support surfaces for the leaf springs and engaging elements. The housing elements act as mediators that maintain precise positioning and alignment of the elastic members without adding complex support structures, thus preserving manufacturing precision while keeping the overall device simple.
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 improves assembly efficiency by simplifying the insertion process and reducing assembly costs, while ensuring stable operation by preventing axial displacement and maintaining proper engagement between components.
Implementation Method 1
elastic members... based on its own elastic restoring force, the elastic members urge the pair of engaging elements in a direction that brings the pressing surfaces closer to the pressed surface
Implementation Method 2
the pair of engaging elements press the pressing surfaces against the pressed surface based on engagement of the output-side engaging portions with the output-side engaged portions so as to frictionally engage the pressing surfaces with the pressed surface
Data Source
AI summary
A reverse-input blocking clutch includes a pressed member having a pressed surface; an input member having an input-side engaging portion; an output member having an output-side engaging portion; an engaging element having a pressing surface, an input-side engaged portion, and an output-side engaged portion and arranged between the pressed surface and the output-side engaging portion with respect to a first direction which is a direction of moving toward or away from the pressed surface; an elastic member that elastically urge the pressing surface toward the pressed surface 7 in the first direction; and a displacement prevention means for preventing relative displacement in the axial direction of the engaging element with respires to the output member.