Chassis Dynamometer Roller Opening Flush Closure Mechanism

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Solution Overview

Problem

The existing chassis dynamometer design results in the opening/closing plate projecting above the pit cover, causing obstacles during vehicle transport and interfering with radio wave measurements, leading to accuracy issues in RF anechoic chambers.

Innovation Solution

A chassis dynamometer with a roller opening open/close mechanism and a roller ascent/descent operation mechanism, where the opening/closing plate is guided to be flush with the pit cover, and an engine cooling duct system that retracts to avoid interference, using a bed on an inclined rail with a motor-driven feed screw and clamp mechanism to maintain alignment and prevent misalignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the opening open/close plate is operated to close the roller opening, then the roller opening is closed to prevent vehicle escape, but the opening open/close plate projects from the upper surface of the pit cover causing obstacles during vehicle transport and interfering with radio wave measurements

Engineering Contradiction:

Improveroller opening closure functionVSAvoidvehicle transport smoothness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The opening open/close plate is made movable in the vertical direction through a guiding mechanism that allows it to ascend and descend. When the roller opening needs to be closed, the plate moves upward to a retracted position above the pit cover, eliminating projection obstacles. This dynamic positioning resolves the contradiction between maintaining closure function and ensuring smooth vehicle transport.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The solution moves the opening open/close plate from a two-dimensional planar closure to a three-dimensional vertical movement. By adding vertical motion capability through the guiding mechanism, the plate can be retracted above the pit cover surface, transforming the closure operation into a multi-dimensional action that eliminates the projection problem while maintaining the closing function.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the opening open/close plate projects from the upper surface of the pit cover, then the roller opening can be closed, but the projecting portion causes large obstruction during vehicle transport and disturbs radio wave reflection in RF anechoic chambers

Engineering Contradiction:

Improveroller opening closureVSAvoidradio wave reflection disturbance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The opening open/close plate is equipped with a guiding mechanism that enables vertical movement. When closing the roller opening, the plate ascends to a retracted position above the pit cover, eliminating projection that would otherwise disturb radio wave reflection. This dynamic positioning ensures both reliable closure and minimal interference with RF measurements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The opening open/close plate is extracted from the pit cover surface plane and positioned above it during closure operation. This extraction eliminates the harmful projection that disturbs radio wave reflection in RF anechoic chambers, while the plate remains functional for closing the roller opening when needed.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the height position of the opening open/close plate is set higher than the pit cover to avoid contact with the roller, then the plate can close the roller opening, but the plate projects from the pit cover causing safety hazards and measurement interference

Engineering Contradiction:

Improveroller opening closure functionVSAvoidplate position control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Instead of fixing the opening open/close plate at a fixed height, a guiding mechanism is provided that allows the plate to dynamically adjust its vertical position. The plate can ascend to a retracted position above the pit cover during closure, avoiding contact with the roller while preventing projection obstacles. This dynamic control resolves the contradiction between functional closure and precise position control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A guiding mechanism acts as an intermediary between the opening open/close plate and the pit cover. This intermediary structure controls the vertical movement of the plate, enabling it to reach the necessary height to close the roller opening while maintaining precise control to prevent unwanted projection and ensure safe operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9212972B2Chassis dynamometer and method of opening and closing a roller opening of chassis dynamometer

Publication Date: 2015.12.15 MEIDENSHA CORP

AI summary

In a conventional chassis dynamometer, when a roller opening formed in a pit cover is closed by an open/close plate, the open/close plate is projected from an upper surface of the pit cover so that irregularities are generated on the upper surface of the pit cover. A chassis dynamometer 1 includes rollers 2, 3 on which wheels of a test vehicle are rested through roller openings 6, 7 formed in a pit cover 5, and an opening open/close mechanism 15 that opens and closes the roller openings 6, 7. The rollers 2, 3 are ascendably and descendably operated by a roller ascent/descent operation mechanism 8. The rollers 2, 3 are operated to descend, and the roller openings 6, 7 are closed by open/close plates 16.