Steering Belt-Pulley Locking Structure to Prevent Slip and Tooth Jump
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Solution Overview
Problem
Existing steer-by-wire steering apparatuses for vehicles experience belt slip and tooth jump issues between the motor pulley, nut pulley, and belt, leading to reduced power transmission efficiency, increased vibration, and diminished steering feel.
Innovation Solution
The proposed steering apparatus incorporates a motor pulley and nut pulley with first grooves on their outer surfaces, a belt with second grooves on its inner surface, and slip prevention members coupled to these grooves to prevent belt slip and tooth jump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a belt is used to connect the motor pulley and nut pulley, then power transmission is achieved, but belt slip occurs reducing power transmission efficiency
Solution Approach 1:
A slip preventing member is introduced as an intermediary element between the belt and pulleys. This member includes engagement protrusions that fit into grooves on the pulleys and engagement holes that receive the belt, creating a mechanical interlocking system that prevents relative slipping while maintaining power transmission function
Solution Approach 2:
The friction characteristics between the belt and pulley are changed by introducing the slip preventing member with its specific engagement structure. The member modifies the interaction parameters by creating positive mechanical engagement through protrusions and grooves, transforming the slipping condition into a locked engagement condition
2Ease of manufacture
If the belt is connected by press-fitting, then assembly is simplified, but tooth jump occurs between the belt and pulley
Solution Approach 1:
The slip preventing member serves as a mediator that combines the advantages of both press-fitting (ease of assembly) and tooth engagement (prevention of tooth jump). The engagement protrusions guide the belt into proper positioning while the engagement holes maintain continuous contact, preventing tooth jump without complex assembly procedures
3Ease of operation
If the belt slips between the pulley and belt, then movement occurs, but dust is generated and steering feel is reduced
Solution Approach 1:
The slip preventing member converts the harmful relative movement (slipping) into a beneficial locked engagement. By preventing the unwanted lateral movement that generates dust, the member ensures smooth power transmission without dust generation, thereby improving steering feel and eliminating the harmful effect
Data Source
AI summary
The present embodiments provide a steering apparatus for vehicle including a motor pulley coupled to the rotation shaft of the driving motor, a nut pulley coupled to the outer circumferential surface of the ball nut, a belt connecting the motor pulley and the nut pulley, a first groove provided on an outer peripheral surface of at least one of the motor pulley and the nut pulley, a second groove provided on an inner surface of the belt at a position opposite to the first groove, and a slip preventing member coupled to the first groove.