Re: transaxle - Saab 900 Bulletin Board - Saabnet.com
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Re: transaxle
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Posted by CMyles [Email] (#1126) [Profile/Gallery] (more from CMyles) on Sun, 28 Dec 2008 11:04:28 Share Post by Email
In Reply to: transaxle, derek900, Sun, 28 Dec 2008 07:50:38
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derek900,
Ahhh, what does Bentley know about anything? "Laygear" refers to the gears on the layshaft, also called the "counter gear" or "cluster gear". These are the gears which are parallel to the input and main shaft gears and transmit the torque from one to the other. In Saab classic 900 five speed transaxles the layshaft is a long steel rod and the laygear is in the form of four gears cut on a single blank (a "cluster gear") which rolls on the layshaft. The cluster gear is driven by another single laygear which is connected by a splined sleeve to the forward end of the cluster gear. That forward laygear meshes with the input gear while the four segments of the cluster gear mesh with the first through fourth mainshaft gears. Fifth is the result of locking the input shaft directly to the mainshaft so no laygears are employed when in fifth.
"Transaxle" is the term for a combined transmission and differential assembly. The transmission provides the ability to trade engine RPMs for torque (gearing) while the differential mainly splits the torque between the left and right drive wheels so you can turn corners. On most rear wheel drive-front engine cars the two are distinct and connected by a driveshaft. Volkswagon, Porsche, Saab and others have used transaxles extensively. Front wheel drive cars with transverse engines use a transaxle which is colloquially known as a "sidewinder". The Saab classic 900 and it's predecessors (the 99, V4 and 2 stroke cars) were somewhat unique in the use of in-line engine and transaxle assemblies.
The teeth which you can see through the jagged hole in that access plate on your transaxle are the teeth of the front laygear and input shaft (but I'll bet some are missing). Cheers

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