Torque Fluctuation Absorbing Apparatus with Nested Thrust Member
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Solution Overview
Problem
Existing torque fluctuation absorbing apparatuses for hybrid driving systems face challenges in downsizing due to the need for larger components to manage fluctuating torque, making it difficult to mount them in vehicles with limited axial space, such as FF-type vehicles.
Innovation Solution
A torque fluctuation absorbing apparatus is designed with a hub member, side-plates, a damper mechanism, a thrust member, and disc springs, which includes a flange portion with reduced thickness and window portions to accommodate coil springs and elastic members, allowing for reduced axial length and improved space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of the torsion member and disc spring is increased to ensure required limit torque, then the limit torque capability is improved, but the overall size of the apparatus increases
Solution Approach 1:
The thrust member is inserted through a bore formed at a bent portion of the side plate, creating a nested structure where the thrust member passes through the bent portion. This nesting arrangement allows the engagement portion to have a reduced axial length while maintaining the required limit torque capability, as the thrust member utilizes the space within the bent portion rather than requiring additional axial space.
Solution Approach 2:
The side plate includes a bent portion that extends in a direction toward the flange portion, creating a three-dimensional configuration. The bore is formed at this bent portion, allowing the thrust member to engage in a spatial arrangement that reduces the axial length requirement. This dimensional change transforms the engagement structure from a simple axial arrangement to a multi-dimensional configuration that saves space.
2Force
If the size of the torque fluctuation absorbing apparatus is increased, then the required limit torque is ensured, but it becomes difficult to mount on FF-type vehicles with limited axial space
Solution Approach 1:
The thrust member is inserted through a bore formed at a bent portion of the side plate, creating a nested structure where the thrust member passes through the bent portion. This nesting arrangement allows the engagement portion to have a reduced axial length while maintaining the required limit torque capability, as the thrust member utilizes the space within the bent portion rather than requiring additional axial space.
Solution Approach 2:
The side plate includes a bent portion that extends in a direction toward the flange portion, creating a three-dimensional configuration. The bore is formed at this bent portion, allowing the thrust member to engage in a spatial arrangement that reduces the axial length requirement. This dimensional change transforms the engagement structure from a simple axial arrangement to a multi-dimensional configuration that saves space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively absorbs torque fluctuations while minimizing the overall size, enabling its use in vehicles with limited axial space without compromising performance.
Implementation Method 1
The first disc spring is provided between the first side-plate and the thrust member and biases the thrust member towards the flange portion of the hub member
Implementation Method 2
both end portions of the coil spring are in contact with the spring sheets, respectively, and the spring sheets and the coil spring absorb a shock generated between the both side-plates and the flange portion because of a rotational difference
Data Source
AI summary
A torque fluctuation absorbing apparatus includes a hub member with a flange portion, first and second side-plates provided at both axial sides of the flange portion, respectively, a damper mechanism absorbing a fluctuation of a relative torque generated between the flange portion of the hub member and the first and second side-plates, a thrust member provided between the first side-plate and the flange portion of the hub member, and a first disc spring provided between the first side-plate and the thrust member and biasing the thrust member towards the flange portion of the hub member. The first side plate includes a bent portion bent towards the flange portion of the hub member and a bore formed at the bent portion, and the thrust member is formed with an engagement portion extending through the bore of the first side-plate and engaged with the bore of the first side-plate.