Power Transmission Apparatus Compact Brake Drum Nesting
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Solution Overview
Problem
The existing power transmission apparatus has a large inter-axis distance between the counter drive gear and the counter driven gear due to the brake drum being fixed to the outer circumferential portion of the center support, making it difficult to reduce the size of the apparatus.
Innovation Solution
The power transmission apparatus is designed with a brake drum fixed to the case near the axis center of the counter driven gear and drive pinion gear, incorporating a supporting member with a drum portion and annular wall portion to reduce the inter-axis distance, and an engagement oil chamber defined inside the drum portion to minimize size while maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the brake drum is fixed to the outer circumferential portion of the center support, then the brake can be properly installed and function, but the inter-axis distance between the counter drive gear and counter driven gear becomes large
Solution Approach 1:
The brake drum is repositioned from the outer circumferential portion to the inner circumferential portion of the center support, utilizing the axial dimension more efficiently. This dimensional repositioning reduces the inter-axis distance while maintaining proper brake installation and function.
Solution Approach 2:
The brake drum is nested within the inner circumferential portion of the center support, allowing the brake assembly to occupy the internal space of the center support structure. This nesting arrangement minimizes the overall footprint and reduces the inter-axis distance between gears.
2Volume of moving object
If the brake drum is positioned closer to reduce the inter-axis distance, then the apparatus size is reduced, but the structural strength and stability may be compromised
Solution Approach 1:
The center support is designed with a predetermined inner circumferential portion that is specifically structured to accommodate the brake drum. This preliminary structural preparation ensures that when the brake drum is positioned in the inner circumferential portion, the structural strength and stability are maintained without compromise.
3Volume of moving object
If the return springs are disposed beside the brake drum, then the brake mechanism can function properly, but the inter-axis distance increases
Solution Approach 1:
The return springs are disposed within the inner circumferential portion of the center support, nested alongside the brake drum in the same radial space. This nested arrangement allows both the brake drum and return springs to coexist in a compact configuration, reducing the inter-axis distance while maintaining proper brake mechanism function.
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 effectively reduces the size of the power transmission apparatus by minimizing the inter-axis distance and optimizing the use of space without compromising the structural integrity or functionality.
Implementation Method 1
a piston that is disposed inside of the brake drum and that presses and engages the first and second friction engagement plates by friction
Implementation Method 2
an engagement oil chamber defined inside of the brake drum and the piston and to which hydraulic oil is supplied
Data Source
AI summary
A power transmission apparatus including a transmission, a case that accommodates the transmission, a counter drive gear to which power from the transmission is transmitted, a counter driven gear that meshes with the counter drive gear, and a drive pinion gear that is disposed and spaced apart in an axial direction from the counter driven gear and that rotates together with the counter driven gear, the power transmission apparatus.