Chain Block Hollow Shaft Nested Drive for Compact Strength
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Solution Overview
Problem
The challenge is to reduce the size of chain blocks while maintaining their strength, as mere size reduction leads to a decrease in strength.
Innovation Solution
The design incorporates a load-sheave hollow shaft with a gear portion meshing with a reduction gear member, featuring a flange portion and chamfered edges, along with guide rollers and a pivotally supported load gear, which enhances strength and reduces size through optimized mechanical components and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the chain block is reduced to improve portability, then the chain block becomes more portable and easier to attach and detach, but the strength of the chain block decreases
Solution Approach 1:
The drive shaft is inserted through the hollow hole of the load-sheave hollow shaft, and the flange portion of the drive shaft is received in the housing recess of the load-sheave hollow shaft. This nested arrangement allows compact integration of components, reducing overall size while maintaining structural integrity through the hollow shaft design that accommodates internal components without compromising strength.
Solution Approach 2:
The flange portion of the drive shaft is designed with an inclined portion that gradually inclines toward the gear portion, and the housing recess includes a bottom portion that receives and supports this flange. This dimensional arrangement optimizes the spatial configuration, allowing compact sizing while distributing stresses effectively to maintain strength.
2Volume of moving object
If the size of the chain block is reduced to improve portability, then the chain block becomes more compact, but the strength and durability of the mechanical components decrease
Solution Approach 1:
The flange portion of the drive shaft is provided with an inclined portion that gradually inclines toward the gear portion, and the housing recess includes a bottom portion that receives and supports this flange. This localized structural enhancement at critical stress points allows compact overall size while maintaining reliability through optimized local geometry that distributes loads effectively.
Solution Approach 2:
The reduction gear member includes a first reduction gear portion meshing with the gear portion and a second reduction gear portion meshing with the load gear. This composite gear arrangement within the compact structure provides reliable power transmission through multiple gear stages, maintaining strength and durability despite size reduction.
Data Source
AI summary
Provided is a chain block with which a reduction in size can be achieved while inhibiting a reduction in strength. A chain clock is provided with: a load-sheave hollow shaft which is provided with a load sheave that rotates to feed a load chain, said load-sheave hollow shaft having a hollow core along the axial direction thereof; a drive shaft which is inserted into the hollow core, and which is provided with a flange portion protruding radially outward from one end side to a base side of a separate gear part; and a reduction gear member provided with first reduction gear part which meshes with the gear part. An accommodating recess is provided at the one end side of the hollow core, said accommodating recess having a bottom part which is where the flange part is positioned, and which is in contact with the flange part. An inclined portion, which gradually inclines further towards the gear part side as said inclined portion approaches a center side in the radial direction, is provided to the flange portion. A chamfered portion is provided to a side of the reduction gear member, said side being the side nearest the flange portion.