Reciprocating Linear Motion Mechanism With Nested Gear-Bearing Layout
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Solution Overview
Problem
Conventional reciprocating linear motion mechanisms for can body makers face challenges in improving production efficiency, extending the life of bearing parts, reducing the outer shape size, and simplifying manufacturing and maintenance processes.
Innovation Solution
The proposed reciprocating linear motion mechanism features a housing with an internal gear, a first rotation body with a convex part, a second rotation body with an external gear meshing with the internal gear, and a second bearing connecting the convex part and the recess, all designed to overlap each other axially, thereby reducing the mechanism's bulkiness and simplifying its structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ram shaft connection part and external gear are integrally formed as a single member, then the structural strength is improved, but the manufacturing cost increases and maintenance becomes difficult
Solution Approach 1:
The second rotation body is divided into two separate members: the external gear and the ram shaft connection part. This segmentation allows each component to be manufactured independently using standard equipment, reducing manufacturing costs while enabling easier maintenance and replacement of individual parts without affecting the other component.
2Length of moving object
If the internal gear, external gear, recess, second bearing, and convex part are arranged to overlap axially, then the outer shape size is reduced, but the structural complexity increases
Solution Approach 1:
The mechanism employs a nested arrangement where the second bearing is positioned inside the axial space occupied by the internal gear and external gear, and the convex part is nested within the recess. This nesting strategy achieves compact axial dimension without significantly increasing structural complexity, as the components are arranged in a straightforward concentric configuration.
3Reliability
If the second bearing is positioned to overlap with the internal gear and external gear, then the unbalanced load on the bearing is reduced, but the oil supply to the bearing becomes unstable
Solution Approach 1:
An oil supply path is introduced as an intermediary element that penetrates the internal gear to deliver oil directly to the second bearing. This mediator overcomes the instability caused by the overlapping arrangement, ensuring reliable lubrication while maintaining the bearing's favorable positional relationship with the gears for reduced unbalanced loads.
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 configuration enhances production efficiency by reducing power consumption, extends the life of bearing parts by reducing unbalanced loads, and simplifies manufacturing and maintenance by allowing for easier assembly and access to components.
Implementation Method 1
a second rotation body including an external gear meshing with the internal gear about the second center axis
Implementation Method 2
a first bearing connecting the housing and the first rotation body to be relatively rotatable; a second bearing connecting the convex part and the recess to be relatively rotatable
Data Source
Figure 1
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AI summary
A reciprocating linear motion mechanism for a can body maker includes: a housing including an internal gear; a first rotation body ; a first bearing connecting the housing and the first rotation body ; a convex part protruding toward one side of an axis direction in the axis direction; a second rotation body including an external gear meshing with the internal gear; a recess recessed toward onside in the axis direction from a surface facing the other side of the second rotation body in the axis direction and into which the convex part is inserted; a second bearing connecting the convex part and the recess ; and a ram shaft connection part connected to the second rotation body and moved linearly in a reciprocating manner, wherein the internal gear, the external gear, the recess, the second bearing, and the convex part overlap each other.