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When you take apart and look inside a gearbox, you will find a huge assortment of parts in a fairly small space. Among other things, you see:
In an automatic gearbox:-
- * An ingenious planetary gear set
- * A set of bands to lock parts of a gear set
- * A set of three wet-plates clutches to lock other parts of the gear set
- * An incredibly odd hydraulic system that controls the clutches and bands
- * A large gear pump to move gearbox fluid around
Manual gearboxes you will find a lay shaft, collar and folks.
Manumatic gearboxes Manumatic is a portmanteau word, combining the words manual and automatic, that applies to a class of automotive gearboxes. Manumatic most often refers to an automatic transmission, with some elements of manual transmission control (e.g. a gear can be manually selected instead of having the computer control all shifts). This type of transmission was introduced in the beginning of the 21st century. Different car manufacturers have been using a variety of labels for their manumatic transmissions, such as ‘tiptronic’, ‘Geartronic’, ‘Touchshift’, ‘Sporttronic’, and others.
The RDX possess SportShift five-speed automatic gearbox with manual paddles.
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To improve steering precision, a stay (or stiffener) supports each end of the steering rack, further improving steering rigidity. In addition, the rack-and-pinion gearbox has aluminum mounting brackets. When a severe crash occurs these aluminum brackets are designed to break off when the engine is pushed rearward into the rack-and-pinion gearbox. This helps reduce intrusion into the interior.
Acura RDX Gets Better Fuel Economy
Underneath, though, the RDX gearbox is mostly unchanged. The biggest mechanical difference is the option to drop half of the drivetrain in favor of better fuel economy. For 2010, the RDX will also come with a 2WD configuration powering the front wheels. Dropping the rest of the SH-AWD drivetrain saves 200 lbs. and improves fuel economy by 2 mpg city and highway, to a tune of 19 mpg city and 24 mpg highway. Power still goes to the ground via Acura’s SportShift five-speed automatic gearbox with manual paddles, and that power comes from the same 2.3L turbocharged four-cylinder engine. The only work under the hood involved a thicker intake pipe and a new, dual-stage radiator fan designed to reduce engine noise. Power numbers remain the same for the RDX’s turbo four, sitting at a healthy 240 hp and 260 lb-ft.
The RDX also gets new 10-spoke aluminum wheels, but perhaps the most important change is the availability for the first time of a front-wheel-drive variant, which raises fuel economy to 19 mpg city and 24 mph highway from 17 mpg city and 22 mpg highway on all-wheel drive models, and lowers the price by £2000. For metro markets in warmer climes, where there is less need for enhanced traction, those smaller numbers may well translate into more sales.
The 2010 Acura RDX shines with its lively gearbox and turbocharged engine and sporty handling, which earn it comparisons to the high-performing BMW X3. However, a downside is that all-wheel drive is no longer standard since the lineup now includes a new front-wheel-drive base model (on the plus side, that model comes with improved fuel economy).
Gearboxes primary job
Just like that of a manual gearbox, the automatic gearboxes primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds.
Without a gearbox, cars would be limited to one gear ratio, and that ratio would have to be selected to allow the car to travel at the desired top speed. If you wanted a top speed of 80 mph, then the gear ratio would be similar to third gear in most manual gearbox cars. You’ve probably never tried driving a manual gearbox car using only third gear. If you did, you’d quickly find out that you had almost no acceleration when starting out, and at high speeds, the engine would be screaming along near the red-line. A car like this would wear out very quickly and would be nearly undriveable.
The key difference between a manual and an automatic gearbox is that the manual gearbox locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios, while in an automatic gearbox; the same set of gears produces all of the different gear ratios. The planetary gear set is the device that makes this possible in an automatic gearbox.
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