Featured Product
This Week in Quality Digest Live
Metrology Features
National Physical Laboratory
Using Raman spectroscopy for graphene and related 2D materials
Keith Irwin
Pros and cons of X-ray and CT techniques
Peter Büscher
Best practices for fluid sampling in cleanliness analysis
Bo Ingves
With milk prices skyrocketing, reducing waste is critical for dairy plants
NIST
AI monitors real-time data from the physical system

More Features

Metrology News
New features revolutionize metrology and inspection processes with nondimensional AI inspection
Engineering and computer science students receive new lab and learning opportunity
Supports robots from 14 leading manufacturers
Ultrasonic flaw detector now has B/C scan capability, improved connectivity, and an app to aid inspection
Tapping tooz for AR/VR competence center
Initial solutions focus on reducing electronic waste through carbon dioxide impact tracking and recyclability
Investigating hyperspectral imaging on unmanned systems
Customers can place orders in a self-service configurator
Application now supports 14 leading industrial robot manufacturers

More News

Quality Digest

Metrology

Marposs’ NVH Gear Tester Helps EV Manufacturers Achieve Silent Drivetrains

Detect macro-geometry (nicks, runout) and micro-geometry (gear-mesh excitation, ghost orders) defects

Published: Wednesday, December 22, 2021 - 13:00

(Marposs: Auburn Hills, MI) -- Marposs, a leader in measurement, inspection, and test technologies, has announced its NVH Gear Tester for identifying potential gear defects at the component level prior to gear box assembly. The NVH gear tester, which works on the single-flank testing principle of one master gear meshing with the component under inspection, is able to detect macro-geometry (e.g., nicks, runout) and micro-geometry (gear-mesh excitation, ghost orders) defects that cause gear whine and noise phenomena.

With electrification of the automotive industry, many hybrid electric vehicle (HEV) and full electric vehicle (EV) drivetrains are facing challenges such as increased NVH requirements in high-speed e-Drives. And, although the number of gear wheels is significantly reduced in electric vehicles due to the use of one- or two-speed reducers instead of the classic manual, automatic, or twin-clutch gearboxes, these gear wheels are loaded with torque and rpm not previously found in high-volume production.

With hybrids and EVs, the noise from an internal combustion engine (ICE) is intermittent or nonexistent, so that transmission makes the most dominant vehicle noise. Noise, therefore, becomes not only a mechanical issue for the performance of the transmission, but also a comfort issue for the driver.

Basically, the concept of NVH testing is to stress the gears by applying rotation speeds and torque values similar (or even higher) to those that are applied in real working conditions. The ability to test gears at operating conditions almost comparable to the final e-Drive is a main benefit of the NVH Gear Tester.

The output parameter is the angular acceleration of the part (or master), evaluated instantaneously and in the long run with the use of encoders (TE inspection) and torsional accelerometer (TAC inspection). The stiff granite structure of the NVH Gear Tester makes it impervious to external interferences, and a highly configurable software make this system as good as correlating data with the end-of-line test rig.

The NVH Gear Tester has a max rotating speed of 3,000 rpm, a driving torque of 0–30 Nm, and can accommodate a max gear-tooth height of 70 mm and shaft length of 280 mm. It can be designed to work with either manual or automatic loading.

To find out more information on the M62 Flex, visit the company’s website, call toll-free (888) 627-7677, or email marposs@us.marposs.com.


The Marposs NVH Gear Tester identifies potential gear defects at the component level that can lead to transmission noise.
The Marposs NVH Gear Tester identifies potential gear defects at the component level that can lead to transmission noise.

Discuss

About The Author

Quality Digest’s picture

Quality Digest

For 40 years Quality Digest has been the go-to source for all things quality. Our newsletter, Quality Digest, shares expert commentary and relevant industry resources to assist our readers in their quest for continuous improvement. Our website includes every column and article from the newsletter since May 2009 as well as back issues of Quality Digest magazine to August 1995. We are committed to promoting a view wherein quality is not a niche, but an integral part of every phase of manufacturing and services.