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1. (of a gearbox, etc.) having a system of clutches that synchronizes the speeds of the driving and driven members before engagement to avoid shock in gear changing and to reduce noise and wear
2. a gear system having these features
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in motor vehicles, a device for the unstressed and noiseless meshing of gears in the transmission of passenger automobiles and trucks. The action of a synchro-mesh is based on the prior equalization of the angular speeds of the transmission’s driven shaft and the gears attached to the driving shaft by means of friction between the engaged parts. A synchromesh consists of a carrier that slides along splines on the driven shaft and a sleeve connecting two friction rings with conical inner surfaces. The friction between the conical surfaces of the gear and the friction ring of the clutch equalizes the rotational speeds, after which the transmission is engaged without clashing.

The use of synchromesh for all speeds in a transmission (with the exception of reverse) provides easy engagement of the gears, eliminates the danger of chipping gear teeth, and lengthens the operating life of the transmission.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(mechanical engineering)
An automobile transmission device that minimizes clashing; acts as a friction clutch, bringing gears approximately to correct speed just before meshing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Bad clutch, no synchromesh, it would buck and kick up dust like a frolicking calf in the sun if he shifted through the reluctant gears without a sure but subtle, strong but gentle touch.
Whilst the wheels of your life are turning in perfect synchromesh you could just sit back.
The newer car has a four-speed gearbox and the older a three-speed - both without synchromesh on first gear.
Mechanical and hydrostatic powertrains, rigid drive, steer drive and dead steer axles, powershift transmissions, synchromesh transmissions.
Valve Train Components, which employs 30 at its facility on the Ringway Industrial Estate, showcased expertise in valve collets, retainers, synchromesh sliding keys and other components to over 500,000 visitors.
This equipment, with the skills and ingenuity of its workforce, helps the com-pany produce over 300 million valve collets and 30 million synchromesh sliding keys per year.
There will be Scousers who feel Gattuso is whining like the synchromesh on an old Fiat.
He is a well-respected motor correspondent and motor cycle enthusiast, and Drive On is in fact a kind of potted engineering history which some may find an amusing substitute for resort to an automotive encyclopaedia should they desire to find out about the origins and antecedents of synchromesh or front-wheel drive.
The 6-speed manual gearbox developed for the Volvo S60 R and VT0 R now has made its entry in the Volvo S40 T5 which features triple synchromesh. The normally aspirated engines are mated to a new generation of Volvo's 5-speed manual gearbox.
Tracy, a graduate of Cardinal Sit itch College, worked at Synchromesh Consulting, AF Business Solutions, Metavante and American Appraisal Associates before working for AQS.