Adjustable Plastic Gearbox Housing for Fit Error Compensation
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Solution Overview
Problem
Conventional plastic gearboxes face accuracy issues due to injection molding limitations, leading to fit errors and increased backlash, which result in vibration, noise, and reduced lifespan, while traditional metal gearboxes are heavy and costly.
Innovation Solution
A plastic gearbox housing with an adjusting mechanism that can be squeezed inwardly to compensate for fit errors, comprising taper portions, squeeze bodies, and self-locking adjusting elements to reduce inner diameter and prevent looseness, allowing for improved manufacturing precision and reduced thickness without special machining processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic injection molding is used to manufacture gearbox housing, then manufacturing cost and weight are reduced, but manufacturing precision and fit accuracy deteriorate
Solution Approach 1:
The housing transitions from a static rigid structure to a dynamic adjustable structure. The adjustable mechanism allows the housing inner diameter to be modified after injection molding, enabling compensation for dimensional deviations and achieving accurate fit with the transmission assembly despite the limitations of plastic molding precision.
Solution Approach 2:
The physical parameter of the housing (inner diameter) is made changeable through the adjustable mechanism. By modifying the inner diameter parameter, the system compensates for the inherent precision limitations of injection molding, allowing the housing to adapt to different fit requirements without requiring high-precision molding processes.
2Manufacturing precision
If housing wall thickness is reduced to enable easier injection molding, then manufacturing precision improves, but structural strength deteriorates
Solution Approach 1:
The housing system becomes a composite structure combining plastic material with metal adjustable components (screw, adjusting ring, etc.). This composite construction allows the plastic housing to maintain thin walls for easy molding while the metal adjustable mechanism provides the necessary structural reinforcement and load-bearing capability.
Solution Approach 2:
The adjustable mechanism introduces dynamic elements (screw threads, adjusting rings) that can be tightened to locally reinforce the housing structure. When the adjusting mechanism is engaged, it creates localized stress distribution that compensates for the reduced wall thickness, maintaining structural integrity while allowing thin-walled design.
3Manufacturing precision
If adjustable mechanism is added to compensate fit error, then fit accuracy improves, but device complexity increases
Solution Approach 1:
The adjustable mechanism is segmented into distinct functional components: the adjusting ring, screw, and supporting ribs. This segmentation allows each component to perform its specific function independently while maintaining overall simplicity. The adjusting ring provides the adjustment interface, the screw provides the adjustment action, and the ribs provide structural support.
Solution Approach 2:
The adjustable mechanism serves multiple functions: it compensates for fit errors, reinforces the housing structure, and provides an adjustment interface for installation. By integrating these multiple functions into a single mechanism system, the patent avoids adding separate components for each function, thereby limiting the increase in overall device complexity.
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 effectively reduces backlash and vibration, enhances manufacturing precision, and lowers production costs by allowing for thinner walls and easier assembly, while maintaining strength and stability.
Implementation Method 1
an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body
Implementation Method 2
the adjusting element comprises an adjusting bolt having a self-locking helix angle
Implementation Method 3
a self-locking helix angle
Data Source
AI summary
A housing for a plastic gearbox and associated plastic gearbox and a robot. The housing includes a body including an inner engaging portion circumferentially arranged on an inner surface of the body, the inner engaging portion adapted to be engaged with a transmission assembly of the plastic gearbox; and an adjusting mechanism arranged around the body and operable to squeeze the body inwardly to reduce an inner diameter of the body. By using the adjusting mechanism to squeeze the body of the housing inwardly, the fit error between the inner engaging portion and the transmission assembly can be compensated in an efficient way. Furthermore, the adjusting mechanism is a part of the housing and thus the body of the housing which is made of plastic does not need to be too thick, which makes injection molding easier and manufacturing precision improved.