Planetary Transmission Testing Without Carrier Bearings
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Solution Overview
Problem
Modern planetary transmissions without planetary carrier bearings cannot be tested efficiently on existing test benches, requiring complex and costly system-level tests, which is a challenge especially in wind power applications where high reliability and certification are critical.
Innovation Solution
A test bench equipped with a central bearing unit that rotatably mounts the planetary carrier and centers the ring gear with respect to the carrier, allowing for the transmission of test loads through a flange to the housing, enabling standalone testing of these transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If planetary transmissions are designed without planetary carrier bearings to reduce complexity and cost, then device complexity and manufacturing cost are reduced, but the ability to test these transmissions on existing test benches is lost
Solution Approach 1:
A central bearing unit is introduced as an intermediary component on the test bench to support and center the planetary carrier during testing. This mediator enables the transmission without planetary carrier bearings to be tested on conventional test benches by providing the necessary support function externally.
2Reliability
If system-level testing is used for planetary transmissions without planetary carrier bearings, then reliable testing is achieved, but test complexity and investment costs increase significantly
Solution Approach 1:
The support function for the planetary carrier is extracted from the transmission itself (planetary carrier bearing) and relocated to a separate central bearing unit on the test bench. This allows the transmission to be tested as a standalone module with reduced complexity while maintaining testing reliability.
3Ease of operation
If dedicated planetary carrier bearings are added to enable testing, then testability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of adding a dedicated planetary carrier bearing to the transmission, a central bearing unit serves as an intermediary on the test bench that provides the necessary support during testing, avoiding permanent modification to the transmission design.
4Measurement precision
If complex system-level test benches are used, then accurate testing of transmissions without planetary carrier bearings is possible, but space requirements and investment costs increase
Solution Approach 1:
The central bearing unit is designed to perform multiple functions (supporting the planetary carrier, centering the ring gear, accommodating various planetary transmissions) within a compact structure, enabling accurate testing without requiring large specialized test bench 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
Enables efficient and cost-effective testing of planetary transmissions without planetary carrier bearings, reducing space and weight requirements, and facilitating reliable testing suitable for wind power applications with reduced complexity and cost.
Implementation Method 1
a central bearing unit (3) which is connected to the planetary transmission (2) and holds and centers the latter
Implementation Method 2
A flange (6) on the central bearing unit (3) or on the planetary transmission (2) serves, inter alia, for further connection of the central bearing unit (3) to the planetary transmission (2)
Data Source
AI summary
A test bench for testing a planetary transmission is provided. In order to utilize the test bench for a planetary transmission without a planetary carrier bearing, the test bench has a central bearing unit. The central bearing unit is configured to rotatably mount a planetary carrier of a first stage of the planetary transmission, and the central bearing unit is configured, furthermore, to center an internal gear of the planetary transmission with respect to the planetary carrier.