Flywheel Damper Hole Layout for Strong Fixation in Compact Assemblies
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Solution Overview
Problem
Existing power transmission devices with flywheels and damper devices face challenges in achieving high strength fixation while minimizing device size, as the placement of bolts and coil springs increases the overall size due to the need for larger holes in the hub flange.
Innovation Solution
The power transmission device incorporates a flywheel with fixation holes and a damper device featuring input and output rotary members with asymmetrical arranging of assembling holes, allowing for high strength fixation without increasing the device's size by optimizing the placement of elastic members and accommodation spaces, and includes a torque limiter unit with a release mechanism for easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bolts are attached to positions on the circumference of an imaginary circle with as large a radius as possible to fix the flywheel with high strength, then the fixation strength is improved, but the device size increases due to larger holes required in the hub flange
Solution Approach 1:
The invention divides the assembly holes into two distinct groups: a first group of assembly holes positioned at a larger radius for high-strength fixation, and a second group of assembly holes positioned at a smaller radius for accommodating coil springs. This segmentation allows each group to serve its specific function without compromising the other, resolving the contradiction between fixation strength and device size.
Solution Approach 2:
The invention transitions from a single-plane hole arrangement to a multi-dimensional arrangement by positioning different groups of assembly holes at different radial distances from the rotation axis. This dimensional differentiation enables the coexistence of large-radius holes for strength and small-radius holes for spring accommodation, eliminating the need to choose between the two conflicting requirements.
2Ease of manufacture
If window holes for accommodating coil springs are provided as much on an outer peripheral side as possible, then the coil springs are properly positioned, but the entire device size increases
Solution Approach 1:
The invention segments the assembly holes into two functional groups: the second group of assembly holes is specifically positioned at a smaller radius to accommodate coil springs, while the first group handles fixation requirements. This segmentation allows coil springs to be properly positioned without requiring the entire device to expand in size.
Solution Approach 2:
The invention applies local quality by creating a specific region (the second group of assembly holes at smaller radius) dedicated to coil spring accommodation, while other regions (first group of assembly holes at larger radius) handle fixation. This localized functional differentiation allows each component to be optimally positioned without increasing overall device dimensions.
3Adaptability or versatility
If multiple assembly holes are provided for both fixation and spring accommodation, then both functions are achieved, but the complexity of hole arrangement increases
Solution Approach 1:
The invention simplifies the overall design complexity by clearly segmenting assembly holes into two groups with distinct functions and positions. The first group (larger radius) handles fixation, while the second group (smaller radius) handles spring accommodation. This clear segmentation makes the hole arrangement systematic and manageable rather than chaotic.
Solution Approach 2:
The invention employs asymmetric arrangement of the two groups of assembly holes, with the first group positioned at a larger radius and the second group at a smaller radius. This asymmetric positioning naturally differentiates their functions and simplifies the design process by providing clear spatial differentiation rather than requiring complex symmetric patterns.
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
This configuration enables robust fixation of the flywheel while maintaining a compact device size, allowing for efficient torque transmission and easy removal from the crankshaft, thus addressing the size and strength challenges of existing designs.
Implementation Method 1
a pair of first elastic members. The output rotary member is rotatable relative to the input rotary member. The pair of first elastic members elastically couples the input rotary member and the output rotary member in a rotational direction
Data Source
AI summary
A power transmission device includes a flywheel and a damper device. The flywheel includes a plurality of fixation holes. The damper device includes an input rotary member, an output rotary member, and a pair of first elastic members. The input rotary member and output rotary member each include a plurality of assembling holes disposed in corresponding positions to the plurality of fixation holes of the flywheel. The plurality of assembling holes are arranged in a circumferential direction such that two pairs of the assembling holes, each pair including two adjacent assembling holes, are each disposed at a larger interval than remaining assembling holes to produce a pair of accommodation spaces. A pair of first accommodation portions, accommodating the pair of first elastic members, is disposed radially outside the pair of accommodation spaces.