Auto Tech Continuously Variable Transmissions Autos ca

22 Апр 2014 | Author: | Комментарии к записи Auto Tech Continuously Variable Transmissions Autos ca отключены
Lexus ES Electric Cars

May 8, 2001

Continuously Variable or CVT s, as they are called in the trade, are in snowmobiles, some all terrain (ATV s), and a few automobiles. A continuously transmission works just it sounds. It continuously varies the ratios between the engine and the drive.

There is no need to different gears: just the shifter in forward and away you go.

Why use a CVT than a conventional automatic or transmission? The answer is efficiency; efficiency. With a CVT,the goes from an idle to a rpm immediately so the engine input is and the transmission varies the output for smooth, seamless acceleration.

the engine at a constant rpm allows the to optimise ignition timing, design, and manifold tuning for volumetric efficiency and low emissions.

reasons for using CVT s include of design, and smooth power to the ground. The simplicity part by using fewer parts. with reverse gear have more parts a simple forward drive, but are still fewer parts and to manufacture.

The smooth power application of CVT s is in off-road vehicles. Power can be without any jerks or surges could cause the vehicle to traction on steep climbs or terrain.

In this cutaway of a General Motors CVT, you can see the controlled variable width and the metal drive chain.

So how do work? The two most common use a belt or a chain.

Let s look at first. They use a belt. On a there are two pulleys connected by a drive belt. Both are V shaped and the width of the V can be varied.

The pulley is connected to the engine and the of the pulley is controlled by engine At idle, the pulley is wide and the is not gripped.

Push on the throttle, and the governor the pulley sides to move When engine speed it s maximum, the pulley continues to narrower as vehicle speed causing the drive belt to up and keeping the engine at its peak

The driven pulley also its width, but its main job is to keep the out of the belt. The driven pulley are spring loaded to force together, and as the drive pulley up, the belt climbs up the drive causing the belt to tighten, the driven

pulley apart. The width of the pulleys and the variable of the belt from the centre of the provide the continuously variable

Automobiles with CVT s use a drive instead of a rubber belt. The is stronger and more durable on a heavier vehicle. Although more complex, automotive CVT s use width pulleys just snowmobiles.

Hydraulics and computer controls are to vary the width of the drive

They say you can t push a chain, but is exactly what happens automotive CVT s. The flexible chain more like a squashed toy than a conventional chain. It easily around the pulleys but into a solid drive torque is applied to it on the drive of the pulley.

The chain pushes the This special chain is the part of CVT operation.

Several offer CVT s, but they are not commonly in Canada. Honda, Subaru, Motors, and Nissan are some that build automotive CVT s.

Lexus GS Electric Cars

is the Honda Rubicon s computer variable angle plate varies the output of the hydraulic and therefore the speed of the machine. The plate is supported by a bearing and with the motor.

The Rubicon CVT swash plate is by the motor to operate the pump

The output end of the Rubicon CVT is a variable hydraulic motor with 9 Seven pump plungers are on the opposite end of the assembly. The control can be seen in the background.


Recently, I ran a new type of CVT. Designed by Mr. himself, it was offered in Japan on a Honda motorcycle in the early s. It was ahead of its time.

Seven ago, the Honda engineers it back off the shelf and applied technology to put it back into Now it is featured on a Honda ATV: the

This design uses no chains, or pulleys. It operates by and is so small you can hold the complete in one hand. After seeing it it still took me a couple to figure out exactly how it works, but the principles are easy.

Both the input and output of the are on the same shaft. When the runs, an angled swash driven by the motor causes in the input side of the CVT to pump The oil flow is controlled by eccentric valves that direct the to the

output side of the CVT. The side is essentially a hydraulic and oil pressure acts on plungers to them outward against an plate. As the plungers push they try to move down or to the part of the plate, causing the and pump housing to rotate.

The part of this transmission is the of the plate that the hydraulic plungers push against. A uses several sensors to the best angle for the plate and operates a small electric that changes the plate

In simple terms, this CVT the motor to drive a pump, in turn drives a variable motor. The neat part it is how compact everything is!

The Honda CVT is only available on the Rubicon ATV now, but it wouldn t surprise me to see it up on a small Honda car in the future. For years, continuously variable were a novelty. Modern controls and new metallurgy now enable to become viable alternatives for shifty transmissions.

Lexus IS Electric Cars

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