Portable On-Vehicle Dynamometer With CV Joint Inclination Compensation
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Solution Overview
Problem
Existing portable on-vehicle dynamometers face challenges with large dimensions, unreliable measurements due to wheel slippage, and limited ability to compensate for wheel hub inclination, leading to potential safety issues and instability during use.
Innovation Solution
A portable on-vehicle dynamometer with a containment chassis and mechanical transmission means, including a connecting flange and a CV joint that allows for angulation and compensation of wheel hub inclination, ensuring stable and safe connection to the wheel hub, even at extreme angles, using a CV joint with extended structure and adjustable bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed dynamometer with a drum is used to measure engine power, then measurement capability is provided, but the instrument has large dimensions making placement complex and requiring stabilization structures
Solution Approach 1:
The invention extracts the essential measurement function from the traditional large drum dynamometer structure. By using a compact drum connected via a CV joint to the wheel hub, the patent removes the need for large stabilizing frames and complex support structures, retaining only the critical measurement components in a portable configuration.
Solution Approach 2:
The invention introduces dynamic adaptability through the CV joint mechanism that allows the drum axis to dynamically adjust to various wheel hub inclination angles. This dynamic capability enables the compact instrument to maintain accurate measurements despite variations in vehicle positioning and wheel alignment, replacing the need for large rigid stabilization structures.
2Ease of operation
If the wheel is simply positioned on the drum, then connection is simple, but measurement reliability is compromised due to wheel slippage
Solution Approach 1:
The invention introduces a CV joint as an intermediary mechanism between the wheel hub and the drum. This intermediary component maintains direct mechanical connection without slippage while accommodating angular misalignments, thereby ensuring reliable torque transmission and accurate measurements without compromising connection simplicity.
3Adaptability or versatility
If a CV joint is used to connect the drum to the wheel hub, then adaptability to wheel hub inclination is improved, but axial rigidity is insufficient for high inclination angles and safe fastening
Solution Approach 1:
The invention employs a composite connection system combining the CV joint for angular adaptability with an extended structural element providing axial rigidity. This composite approach allows the system to simultaneously accommodate high inclination angles while maintaining sufficient structural strength for safe and reliable fastening to the wheel hub.
Solution Approach 2:
The invention addresses the axial rigidity limitation by extending the CV joint structure along its axis, adding a dimensional element that provides the necessary structural strength. This extension allows the joint to maintain both angular flexibility for inclination compensation and axial rigidity for secure fastening at high design angles.
4Measurement precision
If the drum axis is directly connected to the wheel hub, then measurement accuracy is improved by avoiding slippage, but the system cannot compensate for camber and toe angles
Solution Approach 1:
The invention introduces dynamic adaptability through the CV joint mechanism that allows the drum axis to dynamically adjust to various wheel hub inclination angles. This dynamic capability enables the system to maintain direct mechanical connection for accurate measurements while simultaneously compensating for camber and toe angles through angular adjustment.
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
The solution provides high efficiency, cost-effectiveness, and stability, allowing accurate power measurements by compensating for various wheel hub inclinations and ensuring safe, easy fixing, even at maximum design angles, while maintaining constant velocity transmission.
Implementation Method 1
a CV joint (7) adapted to connect said flange (6) with one end of said load shaft (4), said CV joint (7) allowing a reciprocal angulation between said load shaft (4) and the rotation axis of said flange (6) with respect to at least one plane of inclination
Data Source
AI summary
A portable on-vehicle dynamometer comprises a containment chassis (2), a drum (3) rotatably housed in said containment chassis (2) to rotate around a load shaft (4), mechanical transmission means (5) adapted to connect said load shaft (4) to the hub of a wheel of the vehicle being measured to transfer the motion of the vehicle engine to said drum (3), wherein said mechanical transmission means (5) comprise a connection flange (6) provided with a central axis of rotation and suitable to be fixed stably but removably to the hub of the vehicle wheel, wherein said mechanical transmission means (5) further comprise a CV joint (7) adapted to connect said flange (6) with one end of said load shaft (4) and designed to allow mutual angular regulation between said load shaft (4) and the central rotation axis of said flange (6) with respect to at least one inclination plane.