Segmented Worm Wheel Structure for High-Power Steering Reducers
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Solution Overview
Problem
The worm wheel of a steering device reducer experiences reduced durability and mechanical strength when high power is transferred from the worm shaft to the steering shaft, leading to increased vibration and noise, which affects the longevity and performance of the reducer.
Innovation Solution
A worm wheel design featuring an outer toothed part with ring-shaped gear teeth and insertion recesses, an inner toothed part with insertion protrusions and coupling protrusions, and a hub, along with a manufacturing method using stacked molds to form these components with plastic resin, enhancing mechanical strength and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power is transferred from the worm shaft to the steering shaft through the worm wheel, then the steering performance is improved, but the mechanical strength and durability of the worm wheel are reduced
Solution Approach 1:
The worm wheel is divided into an outer toothed part and an inner toothed part that are coupled together. The outer toothed part engages with the worm shaft while the inner toothed part is coupled to the steering shaft, distributing the power transfer across multiple engagement points and structural components, thereby maintaining mechanical strength during high power transfer.
Solution Approach 2:
The worm wheel uses a composite structure combining the outer toothed part and inner toothed part with different functional characteristics. This composite design allows optimization of each part for its specific function while maintaining overall structural integrity under high power transfer conditions.
2Ease of manufacture
If the worm wheel structure is simplified for ease of manufacture, then the manufacturing cost is reduced, but the precision and formability of the worm wheel are degraded
Solution Approach 1:
By segmenting the worm wheel into outer and inner toothed parts that can be manufactured separately and then coupled, each part can be optimized for its specific manufacturing process while maintaining high precision. The coupling mechanism ensures accurate alignment and positioning.
Solution Approach 2:
The inner toothed part is nested within the outer toothed part, with the inner part being inserted into the outer part and secured through coupling holes and protrusions. This nested structure allows both parts to be manufactured with high precision independently while ensuring accurate relative positioning when assembled.
Data Source
AI summary
The present embodiments relate to a worm wheel of a steering system speed reducer, and provide a worm wheel of a steering system speed reducer, and a manufacturing method therefor, the worm wheel comprising: an external toothed part having a ring shape, external gear teeth provided on the outer peripheral side thereof, insertion grooves provided on the inner peripheral side thereof, and coupling holes provided on the upper surface and/or the lower surface thereof; an internal toothed part, which has a ring shape, is inserted into the external toothed part, has insertion protrusions provided on the outer peripheral side thereof, and has coupling protrusions provided at locations corresponding to the coupling holes; a hub to which a steering shaft is coupled; and a boss part provided between the outer peripheral side of the hub and the inner peripheral side of the external toothed part.