Safety Belt Retractor Frame Layout for Compact Easy Assembly
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Solution Overview
Problem
Existing safety belt retractors with pretension and load limiting functions face challenges in assembly complexity and size, particularly when a U-shaped frame is not suitable.
Innovation Solution
A safety belt retractor with a frame design that includes a back plate, support legs, and support plates, allowing for easy assembly and integration of components such as a belt reel, locking mechanism, sensing unit, pretension device, and load limiting device, all arranged on one side of the frame for compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a U-shaped frame is used in the safety belt retractor, then the structural strength is improved, but the assembly complexity and overall size increase
Solution Approach 1:
The frame is divided into a back plate and four support legs, where the support legs extend from the back plate and can be separately assembled. This segmentation allows for easier manufacturing and assembly while maintaining the structural integrity of the overall frame structure.
2Stability of the object's composition
If the sensing unit and locking mechanism are arranged on opposite sides of the frame, then the structural balance is improved, but the device size increases
Solution Approach 1:
The sensing unit and locking mechanism are arranged on the same side of the frame, specifically on the front side. This merging of components on one side reduces the overall device size while the frame structure itself provides the necessary structural balance and support.
3Volume of moving object
If multiple components are integrated into a compact arrangement, then the device size is reduced, but the assembly difficulty increases
Solution Approach 1:
The frame is segmented into a back plate and support legs that can be separately manufactured and then assembled. This segmentation maintains ease of manufacture while achieving a compact overall structure, as each component can be optimized independently and then combined.
Solution Approach 2:
The support legs serve multiple functions: they provide structural support, define the positioning of the belt reel through openings, and support the locking mechanism. This multi-functionality reduces the number of separate components needed, achieving compactness without excessive assembly complexity.
Data Source
AI summary
A safety belt retractor, comprising a frame (8) and a belt retracting cylinder (1), the retracting cylinder (1) being rotatably supported in the frame (8) and being composed to be used for winding a woven belt (2). The frame (8) comprises: a back plate (8h), which has a first side and a second side which are opposite to each other, and a first opening (20); a plurality of first supporting legs (8a,8b), extending from the first side of the back plate (8h); a first support plate (11), which is provided with a second opening (21) and is connected to free end regions of the first supporting legs (8a, 8b); a plurality of second supporting legs (8c, 8d, 8e, 8f), extending from the second side of the back plate (8h); and a second supporting plate (9), connected to the free end regions of the second supporting legs (8c, 8d, 8e, 8f). The first opening (20) and the second opening (21) receive the belt retracting cylinder (1). The safety belt retractor is simple in structure and easy to assembly. Also provided is a safety belt device comprising the safety belt retractor.