Transmission Testing Device Thermal Insulation and Rigidity
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Solution Overview
Problem
Existing transmission testing devices face challenges in enhancing measurement accuracy and downsizing, while also protecting torque meters from temperature-related errors and damage due to thermal conduction.
Innovation Solution
The design removes the intermediate shaft between the test product and dynamometer, incorporating a thermal insulation wall and constant temperature chamber to prevent thermal conduction, and uses a flange with a thermal radiation flange to manage heat dissipation, ensuring accurate torque measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an intermediate shaft is used to connect the dynamometer and test product, then the torque meter is protected from direct thermal exposure, but the device size increases and measurement accuracy decreases due to thermal conduction errors
Solution Approach 1:
The patent removes the intermediate shaft from the system entirely. The torque meter is directly connected to the test product's input shaft, eliminating the intermediate component that caused thermal conduction errors and reduced measurement accuracy.
Solution Approach 2:
The patent introduces a thermal insulation wall as an intermediary barrier between the environmental chamber and the torque meter. This thermal insulation wall prevents thermal conduction from reaching the torque meter, protecting it from temperature-related measurement errors without requiring an intermediate shaft.
2Measurement precision
If thermal insulation measures are added to protect the torque meter, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies thermal insulation locally only where needed - specifically at the torque meter location and along its support structure. This targeted approach provides necessary thermal protection without insulating the entire device, thereby minimizing added complexity.
Solution Approach 2:
The thermal insulation configuration is asymmetrically designed based on thermal exposure requirements. The torque meter and its immediate surroundings receive thermal insulation, while other parts of the device remain uninsulated, creating an asymmetric but optimized thermal management system.
3Volume of stationary object
If the intermediate shaft is removed to downsize the facility, then device size decreases, but thermal conduction errors affect the torque meter
Solution Approach 1:
The intermediate shaft is completely removed from the system, reducing device size and simplifying the mechanical connection between the dynamometer and test product.
Solution Approach 2:
A thermal insulation wall is introduced as a protective intermediary between the environmental chamber and the torque meter. This allows the torque meter to be positioned closer to the test product without direct thermal exposure, enabling downsizing while preventing thermal conduction errors.
4Volume of stationary object
If the torque meter is positioned closer to the environmental chamber for compactness, then device size decreases, but temperature errors increase
Solution Approach 1:
The thermal insulation wall serves as a protective intermediary that enables the torque meter to be positioned closer to the environmental chamber without direct thermal exposure. This maintains compact device size while preventing temperature-related measurement errors through the insulating barrier.
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 enhances measurement accuracy, reduces the device's size, increases rigidity and resonance frequency, and effectively protects the torque meter from temperature-related errors, allowing for precise and reliable performance evaluation.
Implementation Method 1
a thermal insulation wall is provided at a test-product-fixing-side inner wall of the test product attachment holder, for suppressing thermal conduction from the environmental chamber
Implementation Method 2
the flange is provided with a thermal radiation flange at a shaft thereof, for preventing conduction of cold atmosphere and hot atmosphere from the environmental chamber to the torque meter through the flange
Data Source
AI summary
Provision of an intermediate shaft and a torque meter between a test product and a dynamometer in a transmission testing device in which the test product is set in an environmental chamber leads to a long axial length and thereby requires a large floor area for setting, and also causes a twisting of a shaft and leads to a poor rigidity. A hollow spacer is provided between a face plate of the environmental chamber and a test product attachment holder to which the test product is attached. A flange with an H-shape in side view is disposed in the hollow of the spacer. The flange has an end connected to an adaptor flange fixed to the test product, and another end connected to a rotating shaft of the dynamometer via the torque meter.