Reclining Mechanism Cam-Spacer Assembly With Fewer Press-Fit Steps
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Solution Overview
Problem
The assembly of reclining apparatuses is cumbersome due to the need for burring to form upright wall portions and press-fitting spacers, making the process troublesome.
Innovation Solution
A reclining apparatus design featuring a rotation cam with a through hole and a spacer with a cylindrical portion that fits into the cam, eliminating the need for burring and press-fitting, and using a single spring to simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If burring is performed to form upright wall portions and press-fitting is used to attach spacers, then the reclining apparatus achieves proper structural assembly, but the assembly process becomes cumbersome and troublesome
Solution Approach 1:
The spacer and rotation cam are merged into a single integrated component. The spacer includes a through-hole that directly receives the rotation cam, eliminating the need for separate press-fitting operations and upright wall formations. This integration reduces the number of assembly steps and eliminates the need for burring operations.
Solution Approach 2:
The complex burring and press-fitting operations are extracted and replaced by a simpler through-hole structure. Instead of forming upright walls through burring and separately press-fitting spacers, the design extracts these complex operations by providing a pre-formed through-hole in the spacer that directly accommodates the rotation cam.
2Productivity
If multiple components (spacer, upright wall portions, rotation cam) are assembled separately, then each component can be manufactured independently, but the overall assembly process becomes more time-consuming
Solution Approach 1:
The spacer and rotation cam are combined into a single integrated component with the through-hole feature. This merging eliminates the need for separate assembly operations, reducing both assembly time and increasing productivity. The rotation cam is directly inserted into the through-hole of the spacer in a single operation.
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 simplifies the assembly process by eliminating the need for burring and press-fitting, reducing complexity and increasing efficiency, while allowing the spring to be laid out externally.
Implementation Method 1
a spring (urging member) 19 locked at one end thereof to the base plate 5 and the other end portion thereof to the rotation cams 9
Data Source
AI summary
A reclining apparatus in which assembly of a rotation cam to be arranged on the side of a center axis with respect to a pole and configured to move to a locked position in which outer teeth of the pole engages inner teeth of a ratchet (first member) is disclosed. A rotation cam 31 is formed with a through hole 31a having a center at a center of rotation thereof, and a spacer 75 provided on a bottom portion of a ratchet (first member) 21 and configured to restrict the pole 33 from moving to the bottom portion of the ratchet 21 is formed with a cylindrical portion 77 configured to fit to the through hole 31a of the rotation cam 31.