Hybrid Transmission Engine Connection Structure Gap Elimination
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Solution Overview
Problem
Hybrid vehicle transmissions experience rattling noise due to backlash and gaps between the rotor shaft of the motor and the splines of the connecting shaft, which affects smooth power transmission and fuel efficiency.
Innovation Solution
A structure that connects the engine to the hybrid transmission using a flange with splines and a drive plate, where the flange is connected to the rotor shaft via a bolt and the drive plate is connected to the crank shaft, eliminating gaps by using locking mechanisms and oil seals for fluid tightness, ensuring a secure and gap-free connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rotor shaft and connecting shaft are connected with splines for smooth assembly, then ease of manufacture is improved, but gaps are created between tooth surfaces causing rattling noise
Solution Approach 1:
A spline filling member is introduced as an intermediary component between the rotor shaft and connecting shaft. This filling member fills the gaps between the spline teeth surfaces, eliminating the rattling noise while maintaining the ease of spline-based assembly. The filling member acts as a mediator that resolves the conflict between assembly ease and noise reduction.
2Ease of operation
If backlash is provided between rotor shaft and connecting shaft for smooth assembly, then ease of operation is improved, but power transmission reliability deteriorates due to gaps
Solution Approach 1:
The spline filling member serves as an intermediary that maintains the beneficial backlash for smooth assembly while eliminating the harmful gaps that compromise power transmission reliability. It fills the void spaces without preventing the necessary movement for assembly.
Solution Approach 2:
The filling member is selectively placed only in the gap regions between spline teeth, leaving other areas unchanged. This local application maintains the overall backlash for smooth assembly while locally eliminating gaps where they cause reliability issues.
3Device complexity
If conventional spline connection is used, then device complexity is reduced, but manufacturing precision deteriorates due to gap formation
Solution Approach 1:
The spline filling member is a simple intermediary component that does not significantly increase device complexity. It is a straightforward element that fits into the existing spline structure, filling gaps without requiring complex mechanisms or additional sophisticated components.
Solution Approach 2:
The filling member changes the physical parameters of the connection interface by occupying the gap spaces. This parameter change eliminates the voids that cause precision issues while maintaining the overall spline connection geometry and functionality.
Data Source
AI summary
Provided is a structure for connecting an engine to a hybrid transmission, the structure including: a connecting unit connected to a rotor shaft at the opposite side and having an edge portion connected to a mass body by a connecting plate; and a drive plate positioned at a side close to a crank shaft so as to be opposite to the connecting unit, the drive plate being configured to connect the mass body and the crank shaft.