Manual Chain Block Reduction Gear Positioning
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Solution Overview
Problem
The existing manual chain block design has a large gear diameter due to the spacing between reduction gear axes and bearings, preventing size reduction without compromising strength.
Innovation Solution
A manual chain block with a reduction gear mechanism positioned internally, utilizing an auxiliary plate with a stepped portion and bearing hole to support the reduction gear shaft closer to the center, eliminating the need for conventional bearings and allowing thinner components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional bearings are used to support the reduction gear shaft, then the bearing strength and reliability are ensured, but the gear shaft cannot be positioned closer to the center, resulting in larger gear diameter and increased overall size
Solution Approach 1:
The patent merges the bearing function with the frame structure by forming a bearing recess directly in the frame body. This integration eliminates the need for separate conventional bearings, allows the reduction gear shaft to be positioned closer to the center, and reduces the overall size of the manual chain block while maintaining structural strength.
Solution Approach 2:
The frame structure is given multiple functions: it provides structural support, houses the bearing recess for the reduction gear shaft, and eliminates the need for separate bearing components. This multi-functionality contributes to size reduction while maintaining reliability.
2Ease of operation
If the reduction gear mechanism is positioned with adequate spacing from the center, then the gear meshing and operation are smooth, but the gear diameter increases and the overall apparatus size cannot be reduced
Solution Approach 1:
By integrating the bearing support function into the frame structure, the patent enables the reduction gear shaft to be positioned closer to the center. This reduces the gear diameter and overall apparatus size while the bearing recess ensures smooth gear meshing through proper support and alignment.
3Ease of manufacture
If the bearing outer shape is considered in the apparatus design, then the bearing installation and support are simplified, but the reduction gear cannot be positioned on the inner side, preventing size reduction
Solution Approach 1:
The patent eliminates separate bearing components by forming the bearing recess directly in the frame. This integration simplifies the overall structure, allows the reduction gear to be positioned on the inner side closer to the center, and enables size reduction of the apparatus while maintaining ease of assembly.
Data Source
AI summary
Disclosed is a manual chain block that achieves a more compact overall device and also does not lose the strength of the device itself by means of the position of a reduction gear of a speed reduction mechanism section being able to be positioned closer to the center regardless of the bearing of a load sheave. In the manual chain block, a load sheave (12) is supported rotatably by a first and second primary frame (11a, 11b) by means of bearings (13a, 13b) with axle sections (12a, 12b) therebetween. A supplemental plate (30)—which forms, in the direction of thrust: a bearing hole (33) of an axle section (16br) of a first reduction gear (16b); and a drawn section (31)—is, in a manner so as to supplement the aforementioned first primary frame (11a), disposed at the periphery of the bearing (13a) that supports the axle section (12a) of the load sheave (12) at the first primary frame (11a).