Hub Bearing Face Splines Synchronize Drive Shaft Rotation
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Solution Overview
Problem
The existing hub bearings fail to synchronize the rotation of the drive shaft with the hub and bearing, leading to slip when a vehicle accelerates rapidly after stopping, which deteriorates the durability of the components and affects vehicle performance.
Innovation Solution
The hub bearing design incorporates face splines on both the hub and the bearing, along with a drive shaft coupling portion with counter splines, to ensure synchronized rotation between the drive shaft, hub, and bearing, using a fixing pin to secure the drive shaft coupling portion, thereby preventing slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hub bearing is used without face splines on both hub and bearing, then the structure is simpler and manufacturing is easier, but slip occurs between hub and bearing during rapid acceleration after stopping
Solution Approach 1:
The hub bearing is divided into distinct functional segments: the hub with first face splines, the bearing with second face splines, and the drive shaft coupling portion with counter splines. This segmentation allows each component to have a specific function while working together to prevent slip, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The drive shaft coupling portion acts as an intermediary component between the drive shaft and the hub-bearing assembly. It features counter splines that engage with both the first face splines on the hub and the second face splines on the bearing, mediating the rotational synchronization and preventing slip during rapid acceleration.
2Reliability
If face splines are added to both hub and bearing for synchronized rotation, then slip is prevented during rapid acceleration, but manufacturing complexity and cost increase
Solution Approach 1:
The face splines on the hub and bearing serve multiple functions: they synchronize rotation during normal operation, prevent slip during rapid acceleration, and provide mechanical engagement for torque transmission. This multi-functionality justifies the manufacturing complexity by eliminating the need for separate synchronization mechanisms.
Solution Approach 2:
The invention changes the geometric parameters of the hub and bearing by adding face splines with specific profiles and orientations. These parameter changes enable synchronized rotation and slip prevention, and while they increase manufacturing complexity, the standardized spline geometry allows for efficient manufacturing processes.
3Ease of operation
If a fixing pin is added to secure the drive shaft coupling portion, then assembly is simplified and components are securely fastened, but the device becomes more complex
Solution Approach 1:
The fixing pin is designed to be inserted through pre-aligned holes in the hub, drive shaft coupling portion, and bearing during assembly. This preliminary alignment of holes guides the assembly process and ensures proper positioning, making the addition of the fixing pin simplify rather than complicate the assembly operation.
Solution Approach 2:
The fixing pin is extracted as a separate, simple component rather than being integrated into the complex spline structures. This extraction allows the fixing pin to serve its specific function of securing the assembly without adding complexity to the rotational synchronization mechanism, and enables easy replacement if needed.
Data Source
AI summary
A hub bearing may include a hub provided with a disc-shaped wheel coupling portion which is coupled to a wheel and a bearing mounting portion which passes through and protrudes from the wheel coupling portion, first face splines being formed on a protruding surface; and a bearing formed with a lower end fixed to the bearing mounting portion such that one side of the lower end comes into contact with the wheel coupling portion and an upper end fixed to a vehicle body, second face splines being formed on one surface of the lower end.